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A study is presently underway on the litchi (Litchi chinensis Sonn.) crop by the authors in a varying sodic environment (pH value ranging from 7.34 - 10.01 for 30 - 90 cm depth). Plant height and annual percent increase in height showed linear decline with increased values of pH (Fig. 1). While more than 50 per cent annual growth in plant height was recorded for pH up to 8.11, the growth reduced to less than 5 per cent in plants where pH was more than 9.0. The variation in water application depth didn’t show any beneficial effect during the period of observations. Fig. 1: Height, growth and soil pH (30-90 cm) relationship for litchi under drip irrigation 1digenous A Iternative to Drip

Figure 1 A study is presently underway on the litchi (Litchi chinensis Sonn.) crop by the authors in a varying sodic environment (pH value ranging from 7.34 - 10.01 for 30 - 90 cm depth). Plant height and annual percent increase in height showed linear decline with increased values of pH (Fig. 1). While more than 50 per cent annual growth in plant height was recorded for pH up to 8.11, the growth reduced to less than 5 per cent in plants where pH was more than 9.0. The variation in water application depth didn’t show any beneficial effect during the period of observations. Fig. 1: Height, growth and soil pH (30-90 cm) relationship for litchi under drip irrigation 1digenous A Iternative to Drip

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ee ee ee eee ee ee The drip irrigation system is very popular in areas of acute water scarcity and places where commercial cultivation is in vogue of cash or horticultural crops. Numerous studies have been conducted in different parts of the country on various crops to quantify the benefits of the use of drip irrigation in terms of increased production and productivity as well as saving of water (Padmakumari and Sivanappan, 1989; Raman, 1999; Sivanappan, 1999; and Singh et al., 2002 etc.). In order to get a realistic figure out of many multi-location trials, the data were compiled by taking arithmetic average of all the reported values for a given crop (Table 2). Among the top ten crops that gave relatively higher increase in yield under drip irrigation are gherkins, mosambi, carrot, beans, mango, turmeric, popcorn, baby corn, papaya and capsicum (Table 2). On the other hand, chilli, coconut, radish, ridge gourd, tomato, guava, cabbage, banana, potato and beet root gave higher water use efficiency. High water saving was observed among beet root, bitter gourd, sweet potato, papaya, radish, sweet lime, mosambi, pomegranate, turmeric and cotton crops.
ee ee ee eee ee ee The drip irrigation system is very popular in areas of acute water scarcity and places where commercial cultivation is in vogue of cash or horticultural crops. Numerous studies have been conducted in different parts of the country on various crops to quantify the benefits of the use of drip irrigation in terms of increased production and productivity as well as saving of water (Padmakumari and Sivanappan, 1989; Raman, 1999; Sivanappan, 1999; and Singh et al., 2002 etc.). In order to get a realistic figure out of many multi-location trials, the data were compiled by taking arithmetic average of all the reported values for a given crop (Table 2). Among the top ten crops that gave relatively higher increase in yield under drip irrigation are gherkins, mosambi, carrot, beans, mango, turmeric, popcorn, baby corn, papaya and capsicum (Table 2). On the other hand, chilli, coconut, radish, ridge gourd, tomato, guava, cabbage, banana, potato and beet root gave higher water use efficiency. High water saving was observed among beet root, bitter gourd, sweet potato, papaya, radish, sweet lime, mosambi, pomegranate, turmeric and cotton crops.
Yield Benefits and Water Saving
Yield Benefits and Water Saving
OR a, ee Rae cee ere ate Drip irrigation in Saline / Sodic Environment Table 2: Contd.
OR a, ee Rae cee ere ate Drip irrigation in Saline / Sodic Environment Table 2: Contd.
Table 4: Yield, irrigation depth, water use efficiency and soil EC for tomato under drip ratios. Results reported in Table 4 suggest that a low IW/PET ratio for irrigation scheduling could be preferable to get high yields, water saving and minimum salt build- up. oe eee a: PM ONIONS oe bec eT sees Le Be eget eg See ec ha a 8 PS ee eg es
Table 4: Yield, irrigation depth, water use efficiency and soil EC for tomato under drip ratios. Results reported in Table 4 suggest that a low IW/PET ratio for irrigation scheduling could be preferable to get high yields, water saving and minimum salt build- up. oe eee a: PM ONIONS oe bec eT sees Le Be eget eg See ec ha a 8 PS ee eg es
Table 3: Water use efficiency as affected by irrigation methods using saline and good quality waters
Table 3: Water use efficiency as affected by irrigation methods using saline and good quality waters
Table 5: Effect of irrigation schedules on growth and yield of sugarcane under drip irrigation
Table 5: Effect of irrigation schedules on growth and yield of sugarcane under drip irrigation
Table 6: EC; under pitcher at which crop yield is same as with fresh water
Table 6: EC; under pitcher at which crop yield is same as with fresh water
Pitcher irrigation is one such technique which has been extensively researched and is gaining popularity. Gupta and Dubey (2001) compiled and reported the results of pitcher irrigation experiments being conducted since 1974. Vegetable crops could be grown with relatively high salinity water with pitcher irrigation (Table 6) as compared to surface irrigation methods. Besides the data presented in Table 6, the observation is fully supported by the general observation that vegetable crops are sensitive to salts and the threshold value of ECiy is usually less than 4 dS m’ (Minhas and Gupta, 1992). Gupta and Dubey (2001) also reported that pitcher irrigation could save a major fraction of water when compared with surface irrigation methods. This observation is fully supported by data provided by Bainbridge (2001) on this issue (Table 7). Apparently there is a scope to develop other indigenous alternatives for use of saline / sodic waters for crop production.
Pitcher irrigation is one such technique which has been extensively researched and is gaining popularity. Gupta and Dubey (2001) compiled and reported the results of pitcher irrigation experiments being conducted since 1974. Vegetable crops could be grown with relatively high salinity water with pitcher irrigation (Table 6) as compared to surface irrigation methods. Besides the data presented in Table 6, the observation is fully supported by the general observation that vegetable crops are sensitive to salts and the threshold value of ECiy is usually less than 4 dS m’ (Minhas and Gupta, 1992). Gupta and Dubey (2001) also reported that pitcher irrigation could save a major fraction of water when compared with surface irrigation methods. This observation is fully supported by data provided by Bainbridge (2001) on this issue (Table 7). Apparently there is a scope to develop other indigenous alternatives for use of saline / sodic waters for crop production.
Related topics:
Soil SalinityDrip / trickle irrigationDrip Irrigation
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