Abstract
A field investigation on Effect of surface fertigation on nutrient removal, fertilizer use efficiency and economics of inter-specific hybrid Bt cotton was carried out at agronomy field unit, UAS, GKVK, Bangalore during kharif 2012. The experiment was laid out in randomized complete block design with 7 treatments and 3 replications involving treatment combinations of 3 splits (T2 and T3), 4 splits (T4 and T5) and 5 splits (T6 and T7) at 75 and 100 per cent dosages of recommended dose fertilizer as compared to recommended dose of fertilizer through soil application. It was observed that significantly higher N, P and K uptake (160.99, 28.57 and 134.87 kg ha -1 , respectively) was recorded in 100 per cent recommended dose of fertilizer with fertigation in 5 splits. The higher nutrient uptake in fertigation treatments was attributed to higher fertilizer use efficiency and nutrient availability in the soil as compared to recommended dose of fertilizer through soil application. Among different treatments, application of 100 per cent recommended dose of fertilizer with fertigation in 5 splits recorded higher net returns (79231 Rs. ha -1 ) and B:C ratio (3.41). It is advisable to adopt 5 splits application of all the major nutrients under surface fertigation to achieve higher cotton productivity and increasing B: C ratio, besides higher cost of cultivation.
Highlights
In India, out of 633 lakh ha irrigated area only 4.5 lakh ha is under micro irrigation system and remaining area is under surface method of irrigation
Total nitrogen uptake at harvest was significantly higher with fertigation which received 100 per cent RDF with fertigation in 5 splits (161.00 kg ha-1) over RDF-soil application and other fertigation treatments
Uptake of NPK in fertigation treatments was significantly superior over the soil application of fertilizer
Summary
Efficiency, Nutrient Uptake, Recommended dose of fertilizer Fertigation has been found to increase the efficiency in the application of fertilizer besides reducing the quantity of fertilizes applied. Applicability of fertigation technique in surface irrigation is more useful, as more irrigated area (>99 per cent) is under surface methods.
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