eChapters

9.1 Introduction

The world is facing various challenges, including climate change, population growth, and decreasing fertile land. It is necessary for the agricultural sector to shift towards sustainability and innovation. To revolutionize traditional farming practices, alternative cropping systems and advanced technologies like plant tissue culture in greenhouses are being explored. The goal is to optimize resource utilization, enhance crop resilience, and reduce the environmental impact. By adopting cutting-edge technologies, such as plant tissue culture, crops can be propagated and cultivated within controlled environments like greenhouses, ensuring global food security and meeting the growing population’s demands.

As early as the 16th century, rhubarb was farmed and marketed for therapeutic purposes. According to History of Fruit, by the 19th century, rhubarb had acquired prominence as a food and vegetable source, with a redder stem and sweeter flavour. Rhubarb is a native of Central Asia, and knowledge of its therapeutic properties dates back five thousand years in China. It was also widely used by Arabs, Greeks, and Romans in antiquity. It came as no surprise to Marco Polo when he discovered it in China in 1271.

Botany and taxonomy: Rhubarb refers to the fleshy, edible stalks (petioles) of Rheum species and hybrids (culinary rhubarb) of the Polygonaceae family, which are cooked and eaten. Rhubarb refers to the entire plant, which is an herbaceous perennial with short, thick rhizomes. The big, triangular leaves are inedible due to high quantities of oxalic acid and throne glycosides. 

Ribbed gourd (Luffa acutangula (L) Roxb.) belonging to the family Cucurbitaceae is a well known vegetable variety in India. The seed production can be done in both summer and rainy season.
Method of seed production

Bitter gourd is a cross-pollinated crop which occurs through bees. Seeds should be allowed to set by open-pollination in isolation. The isolation distance maintained between the fields of other varieties and the fields of the same variety not conforming to the varietal purity requirements for certification is 1000 metres for foundation and 500 metres for certified seed production.

1. Blast
Diagnostic Symptoms
• Pathogen attacks the crop at all stages of crop growth.
• Symptoms appear on leaves, nodes, rachis, and glumes. On the leaves, the lesions appear as small bluish green flecks, which enlarge under moist weather to form the characteristic spindle shaped spots with grey centre and dark brown margin (Leaf blast).
• Spots coalesce as the disease progresses and large areas of the leaves dry up and wither. Severely infected nursery and field appear as burnt.• Black lesions appear on nodes girdling them. The affected nodes may break up and all the plant parts above the infected nodes may die (nodal blast).
• During flower emergence, the fungus attacks the peduncle and the lesion turns to brownish-black which is referred to as rotten neck / neck rot / panicle blast (neck blast).
• In early neck infection, grain filling does not occur while in late infection, partial grainfilling occurs (Fig.1).

Ridge gourd or Ribbed gourd (Luffa acutangula Rox b. L) and Sponge gourd or Smooth gourd (Luffa cylindrica) have diploid chromosome number  2n=2x=26. Luffa has old world origin in Subtropical Asian region including India (Kalloo, 1993). These two species are inter-crossable. F1 plants generally, intermediate between the parents and showed various irregularities like, univalants, rings and chains of 4 chromosomes, chromatids bridges and fragments at metaphase and thus the species are not easily crossable and the F1 plants appear to be of not much practical value. The genus is monoecious annual vine, tendrils are branched, flowers are yellow, anthers are free and pistil has three placentas with many ovules and stigma are three and bilobate. Fruits oblong or cylindrical and rind becomes dry on maturity.

Ridge gourd, Luffa acutangula and sponge gourd, Luffa cylindrica under the family Cucurbitaceae (Chromosome number: 2n = 2× = 26) is an important warm season fruit vegetable crop. Ridge gourd is widely cultivated in India, Southeast Asia, China, Japan, Egypt and other parts of Africa. Sponge gourd is now cultivated in all tropical regions of the world. It was an important crop used for industrial filters until World War II and Japan cultivated the best crop for this purpose. The main commercial production areas of sponge gourd today are China, Korea, India, Japan, Central America and Brazil. Immature fruits of ridge gourd and sponge gourd are eaten as a vegetable and at maturity both become very fibrous. The word luffa or ‘loofah’ is of Arabic origin and the sponge characteristic of the crop has been described in old Egyptian writings.
Fruits are good sources of vitamin C, riboflavin, zinc and antioxidants. It is effective in balancing blood sugar levels, help eliminate toxic waste and prevent fat accumulation. Ridge gourd also helps reduce excessive body heat during summers which can prevent many ailments.
 

Ridge gourd also known as ribbed gourd or angled gourd or silky gourd or angled loofah or vegetable gourd (Luffa acutangula (Roxb. L., 2n = 2x, family Cucurbitaceae, mostly monoecious and cross-pollinated but behaving like self-pollinated crop in term of no inbreeding depression) is not a crop of global importance; rather it is grown and consumed primarily in India and the adjoining countries which used to be part of greater India. In India, estimated area is 50,000 ha spread over almost entire country but the leading states are UP, Bihar, West Bengal, MP, Chhattisgarh, and Maharashtra, Karnataka, Tamil Nadu and north east hill region.

Origin and Domestication

Ridge gourd has similar origin as that of sponge gourd (refer to page 428).

Ridge or ribbed gourd (Luffa acutangula (Roxb.)L.) is grown commercially and in homesteads for its immature fruits which are used as cooked vegetable. It is a popular vegetable both as spring-summer and rainy season crops. It is grown in tropical and subtropical countries, especially in Asia and India as an important cucurbitaceous vegetable crop (Jansen et al., 1993). The immature fruit is a rich source of dietary fiber and minerals (Sheshadri, 1990). Apart from culinary properties, it has vast medicinal properties which are traditionally used for the curing of stomach ailments and fever (Burkill, 1985; Chakravarty, 1990). The genus derives its name from the byproduct 'loofah', which is used in bathing sponges, doormats, scrubber pads, mattresses, pillows and in cleaning utensils. The tender fruits are prescribed for people suffering from malaria and other seasonal fevers because it is easy to digest and act as an appetizer. Ridge gourd contains 0.5g protein, 3.4g carbohydrates, 37mg carotene and 18mg vitamin C per 100g of edible portion. Some round varieties of ridge gourd are also used for stuffing purposes.

Ridge gourd is originated from India and is grown throughout the country by many of the small and marginal farmers for their regular income. Uttar Pradesh, Madhya Pradesh, Punjab, Chhattisgarh, Bihar, West Bengal, Maharashtra and all southern states like Andhra Pradesh, Telangana, Karnataka, Kerala and Tamil Nadu are the major states in India where ridge gourd is cultivated. It is grown in an area of 1.00 lakh ha in India with a productivity of about 10 12 t/ha which is very low.

Ripe

This word is derived from Saxon word ‘Ripi’, which means gather or reap. This is the condition of maximum edible quality attained by the fruit following harvest. Only fruit which becomes mature before harvest can become ripe.

Ripening

Ripening involves a series of changes occurring during early stages of senescence of fruits in which structure and composition of unripe fruit is so altered that it becomes acceptable to eat. Ripening is a complex physiological process resulting in softening, colouring, sweetening and increases in aroma compounds so that ripening fruits are ready to eat or process. The associated physiological or biochemical changes are increased rate of respiration and ethylene production, loss of chlorophyll and continued expansion of cells and conversion of complex metabolities into simple molecules.

6.1 Introduction

Perennial crops are crucial for maintaining food security, despite making up only 4.2–4.7% of all agricultural acreage (Kreitzman et al., 2020). The value of fruit and nut production reached a value of USD 823 billion globally in 2020, with the top five fruit crops being apples (87 Mt), oranges (78 Mt), grapes (77 Mt), mangoes (55 Mt), and apricots (41 Mt) (Statista, 2020). The tree nut business is growing quickly, although making up a smaller share of the world’s agricultural output. Global tree nut output is expected to reach 4.2 Mt in 2019–2020, with almonds, cashews, walnuts, hazelnuts, and pistachios accounting for 31%, 17%, 21%, 12%, and 14% of the nut market share, respectively (Serna, 2020).

Tree crops require a longer investment period before producing a commercial yield; sweet cherry takes three years to attain a commercial yield, while pistachio takes ten (Rezaei et al., 2019). High-density monocultures of cultivars chosen for their potential yield, fruit quality, and disease resistance are part of optimal tree crop production techniques. These monocultures are maintained under intensive, high-input farming systems (Simon et al., 2017). However, inadequate pollination can seriously impair the quantity and quality of these agricultural products, prompting for meticulous dedication to pollination research and management (Bosch et al., 2021; Forbes et al., 2019).

Effective pollination, and on the contrary, situations in which pollination is restricted or deficient, depend on both internal and external factors (Figure 7.1, Table 7.1). The period of stigma receptivity, the lifespan of the ovule, and the quality and availability of compatible, suitable pollen are all considered as intrinsic factors (Howlett et al., 2015). Agronomic methods pertaining to plant nutrition, orchard layout, pest and disease control, pollinator activity, pollen quality, and weather patterns and their effects on flowering synchrony are examples of extrinsic factors(Toledo-Hernandez et al., 2017). Hatfield and Prueger assert that pollination is one of the phenological stages that is most sensitive to temperature, and as such, it has a significant impact on productivity (Hatfield and Prueger, 2015). Climate has been shown to be a key factor in determining pollination success and production in crops including peaches, apples, and almonds.

3.1 Training

Virtual orchards are sophisticated, simulated environments used to train agricultural robots in a controlled, risk-free setting. These virtual landscapes replicate real-world orchards with high fidelity, incorporating detailed models of trees, fruits, branches, and various terrain features. By leveraging advanced technologies like 3D modelling, physics-based simulation, and machine learning, virtual orchards provide a comprehensive platform for developing and testing robotic algorithms without the logistical challenges and costs associated with field trials. In these simulations, agricultural robots can perform various tasks, such as navigating through rows of trees, detecting and localising fruits, and executing precise pruning actions (Shamshiri et al., 2018). The virtual environment allows for testing different path planning and control algorithms, enabling researchers to fine-tune these systems for optimal performance.

Additionally, virtual orchards can simulate various environmental conditions, such as changing light levels, weather patterns, and the presence of obstacles, providing a robust testing ground for robots to adapt to dynamic scenarios. One significant advantage of virtual orchards is the ability to generate large amounts of training data for machine-learning models. Robots can be exposed to many pruning scenarios, enhancing their ability to generalize and perform effectively in real-world conditions. Furthermore, the use of virtual reality (VR) and augmented reality (AR) can aid in training human operators to control and supervise these robots, improving their proficiency and reducing the learning curve (Sarker, 2021).

Soilless media or culture

Gravel culture is a general term which applies to the growing of plants without soil in an inert medium into which nutrient solutions are usually pumped automatically at regular intervals. Haydite (shale and clay fused at high temperatures), soft- or hard-coal cinders, limestone chips, calcareous gravel, silica gravel, crushed granite and other inert and slowly decomposing materials are included in the term “gravel”. The more important greenhouse flowering crops include roses, carnations, chrysanthemums, gardenias, snapdragons, lilies, asters, pansies, annual chrysanthemums, dahlias, bachelor buttons and others.

Media ingredients and Mix

Commercially available materials like peat, sphagnum moss, vermiculite, perlite and locally available materials like sand, red soil, common manure/ compost and rice husk can be used in different proportions to grow greenhouse crops. These ingredients should be of high quality to prepare a good mix. They should be free from undesirable toxic elements like nickel, chromium, cadmium, lead etc. Most common medium other than soil used in India in greenhouses is coco peat. In other countries these are Rockwool and Peat-vermiculite.

Rodents are well recognized pests and are considered the number one enemy of man. These animals, though considered primitive, have been so successful and abundant worldwide that they alone account for more than half of the known mammalian fauna. They can subsist on a variety of food and even without water for a long time. Due to their prowess of adaptability, they have successfully adapted to varied ecological and physiological niches, and therefore are inhabitants of practically each and every latitude and altitude. They multiply at super fast speed because they become sexually mature when they are just 6-8 months old. They then pose a challenge to man in all respects. According to Prakash (1988) in India there are 135 species and about 300 sub-species of rodents belonging to 46 genera. At least 15 of these rodent species are known to be the serious pest of public health hazard (Jain and Tripathi, 1988). Rodents not only damage the crops in the fields, where the infestation occurs at all stages of food production, processing, storage and distribution, they are also responsible for a number of diseases in the human beings.

Rodents attack the-crops shortly after sowing, during the vegetative growth and during the ripening of the seed heads. They damage the various crops of the kharif season viz., jowar, maize, ground nut and cotton as well as the crops of the rabi season viz., wheat and barley etc. They damage other crops also which include paddy, sugarcane, soyabean and Bengal gram etc. Hence some well planned rodent management is the need of the time and before going for the planning of any control method in a given situation it is essential to have an estimation of the population and the species involved.

Micronutrients play an active role in the plant metabolic processes from cell wall development to respiration, photosynthesis, chlorophyll formation, enzyme activity, hormone synthesis, nitrogen fixation, etc. Micronutrient requirements of crops are relatively small. Use of chemical fertilizers with accompanied changes in soil management practices resulted in steady decrease in micronutrient content in soil. The future of agriculture depends on sustainable management of land, water, flora, fauna and the atmosphere. In order to produce 240 m tones of food grains by the end of twentieth century, removal of major nutrients from soil will be to the tune of 7 m tones N, 2.7 m tones P2O5 and 11.2 m tones K2O. Similarly, a good amount of secondary (Ca, Mg, S) and micronutrients would also be removed proportionately which should be compensated through application of well rotten FYM or micronutrient fertilizers in soil.

4.1 Introduction

Pests and plant diseases pose serious risks to global agriculture (Strange and Scott, 2005; Oerke, 2006). Plant diseases and pests are the natural disasters that can impede a plant’s normal growth throughout the plant’s whole life cycle, from seed formation to seedling growth and may result in plant death (Liu and Wang, 2021). Diseases reduce yields in a number of important crops by 21–30% globally (Savary et al., 2019), whereas insect infestations reduce crop output by 30–33% annually (Kumar et al., 2019). For the management, accurate disease diagnosis and pest identification are essential. Artificial intelligence (AI) techniques can be a crucial addition to enable the monitoring of plant diseases and pests at a coarse scale, as traditional field scouting of these pests and diseases is labor-intensive, subject to bias, and typically shows low efficiency (Mahlein, 2016).

Agriculture is undergoing a revolution because of artificial intelligence (AI), which is replacing outdated techniques with more effective ones (Talaviya et al., 2020). AI intervention in agriculture is helping farmers increase productivity and reduce adverse environmental effects (Sujawat, 2021). The application of AI techniques has created new opportunities for scientific research as well as new instruments and ways for handling and analyzing vast volumes of data. An important benefit of AI is its capacity to spot patterns in data that are not immediately obvious or available to humans. This allows for previously unattainable new insights and discoveries (Angermueller et al., 2016; Eraslan et al., 2019). AI is currently changing how we work and live, yet its influence on pathology and entomology research is still underappreciated. AI’s cost-effectiveness, precision, quickness of performance, and adaptability are its core concepts in agriculture (Eli-Chukwu, 2019). In agriculture, artificial intelligence not only helps farmers use their abilities, but it also guides them to obtain better quality and larger yields with fewer resources (Khandelwal and Chavhan, 2019). AI-based technology addresses the issues that agricultural sector faces and helps to increase efficiency in all areas. These challenges include crop harvesting, irrigation, soil content sensitivity, crop monitoring, weeding, harvesting, and establishing.

Bio-stimulants are increasingly used to improve crop performance while reducing dependence on intensive chemical inputs. They include amino acids, protein hydrolysates, humic substances, seaweed extracts, beneficial microorganisms and plant- or microbial-derived compounds. These substances can influence root architecture, nutrient assimilation, hormonal balance, photosynthesis, stress tolerance and disease resistance. This chapter examines the effects of different bio-stimulants on onion seed germination, vegetative growth, bulb development, yield, quality and storage life. It discusses their modes of action, application methods and integration with nutrient-management programmes. Bio-stimulants are presented as promising components of environmentally responsible and resource-efficient onion production, while areas requiring further research are identified.

Introduction

Nature provides a wealth of genetic variation in both wild and cultivated plants. In the advanced selections conducted in developing superior crop varieties cultivated today agriculture represent only a small portion of the available gene pool. However wild species remain a reservoir of valuable genetic variation and represents a valuable source for exploitation of unexplored genetic variation for improvement of various agronomic traits. Most success has come from introgression of specific single gene controlled traits largely for disease resistance (Tomleyson, 2000 and Sergio et al., 2000). The identification of genes and co-adapted gene complexes that control complex agronomic traits such as adaptation to specific environmental stresses, crop quality, yield, plant architecture, flowering time (especially important for vegetable crops) has been less effectively addressed so far and remains a major and immediate challenge. Also, existence of low genetic diversity in breeding lines of many species used in various plant breeding programs is often resulting in development of insignificant improvement of the trait under investigation (Christopher, 2000). Understanding the spectrum, frequency and distribution of allelic variation in genes controlling such multiple genes controlled complex traits will improve our knowledge of exploitation of natural variation and promotes effective management and exploitation of functional biodiversity. In India efforts have been initiated in the exploitation, conservation of crop germplasm and technologies that are needed to fully exploit this natural diversity available in our major crop plants and their wild relatives. For example, centers that maintain diverse germplasm collections (both by ICAR and State Agricultural Universities nation wild are well established.

Introduction
Agriculture plays a vital role in global food security and economic development. However, in many regions, agricultural productivity is hindered by various challenges, including the presence of high soil salinity in agroecological systems (Singh, 2009). Saline agroecological systems are found in various regions worldwide, including coastal areas, arid and semi-arid regions, and areas affected by improper irrigation practices. These systems are characterized by high soil salinity levels, which can have detrimental effects on crop growth, nutrient availability and plant water uptake (Rai et al., 2020). Addressing these challenges requires specialized knowledge and tailored strategies to ensure sustainable agricultural practices in such environments (Dagar et al., 2019;
Sethi et al., 2016). Farm advisory and resource management services play a critical role in assisting farmers in saline agroecological systems by providing expert guidance, information dissemination, capacity building, and policy support (Adak et al., 2020). Farm advisory can play a crucial role in helping farmers understand the intricacies of saline agroecological systems, including the causes of soil salinity, its effects on crop performance, and the necessary strategies for managing these challenges effectively. Farm advisory can assist farmers in selecting suitable crop varieties that exhibit tolerance to high salinity levels. This requires comprehensive knowledge of salt-tolerant crops and and nutritional needs. Providing information on the performance and market
demand of different crop varieties enables farmers to make informed decisions about crop selection, optimizing productivity in saline agroecological systems (Kumar et al., 2020; Singh et al., 2021). It can offer guidance on crop management practices tailored to saline environments by providing recommendations on irrigation scheduling, water management techniques, and appropriate fertilization strategies to minimize salt accumulation and maximize crop yields. Helping farmers implement best practices for s

Introduction
Farm advisories have played a key role in transforming India’s agriculture, helping the country shift from a food deficit to a surplus nation. The Indian public agricultural extension system has been instrumental in this transformation through Green Revolution in the 1960s, but by the end of the 1970s, its role had started to decline. Critics argued that the system had become a monolithic organization without clear objectives (Babu et al., 2013). According to NSSO data, in 2004, public extension services in India, including the Krishi Vigyan Kendra, extension workers, field demonstrations and study tours, reached to less than ten percent of farmers. Instead, farmers relied mostly on other progressive farmers (17%) and input dealers (13%) for information, while mass media including radio, television and newspaper played a significant role reaching to more than thirty percent farmers (Mkhize and Zhou, 2012; Meena et al., 2022a). One of the major constraints in agricultural extension services (AES) in the country is the shortage of extension staff. According to a report, in 2012-13, a single extension functionary served 1,162 operationalholdings, whereas the recommended ratio was 1:400 in hilly areas, 1:750 in irrigated areas, and 1:1000 in rain-fed areas. Input dealers often provide manipulated information specific to the crops grown by farmers, affecting their decision-making process.

Introduction
Horticulture crops hold significant importance for their economic, nutritional, environmental, and aesthetic contributions. They contribute to agricultural GDP, create employment opportunities, and provide income for farmers and other stakeholders along the value chain. Horticultural crops often have highvalue market demand, leading to increased profitability for farmers and rural communities. The horticultural crops, including fruits, vegetables, nuts, and medicinal, spices are rich sources of essential nutrients, vitamins, minerals and dietary fiber. They contribute to a balanced and nutritious diet, promoting good
health and preventing various diseases. Consumption of horticultural crops is linked to reduced risks of chronic diseases, including heart disease and certain types of cancer. These crops have environmental benefits. They contribute to biodiversity conservation by providing habitats for various species and supporting beneficial insects and pollinators. Additionally, horticultural practices such as agroforestry, crop diversification, and organic farming methods can enhance soil health, reduce erosion, promote water conservation, and mitigate climate change impacts. Adak and Pandey (2018) emphasised soil management of horticultural crops for attaining food and nutritional security of farm women. Babu et al. (2022) explained scientific interventions for enhancing productivity and profitability of farmers’ engaged in horticultural sector while Gundappa et al. (2016c) recommended management protocols for effective controls of mango hoppers to growers. Even, digital solutions are now-a-days is being tried to improve economic prosperity of fruit growers (Verma and Adak, 2021). Horticulture crops contribute to food security by diversifying thefood supply. They provide an array of options beyond staple crops, ensuring a varied and nutritious diet for individuals and communities.