Nitrogen Uptake in Mustard 'VARUNA' as Influenced Due to Irrigation Frequencies and Nitrogen Levels Under Saline-Sodic Condition

Abstract

A field experiment was conducted on mustard 'Varuna' with five levels each of irrigation scheduled at different intervals and nitrogen (0,40,80,120 and 160 kg N/ha) on a newly reclaimed saline-sodic soil at University Research Farm, Dahl) Nagar, Kanpu?• for three consecutive rabi seasons of 1978-79 to 1980-81. The results showed that yield, oil content and nitrogen uptake were greatly improved by increasing levels of irrigation as well as nitrogen. Best results were obtained when irrigation was scheduled at 20,30,50,75 and 100 days after sowing and application of 120 kg N/ha. The yield obtained with this treatment was 14.07 g/ha, which was more than 8 times of the yield obtained with the treatment combination of 3 irrigations scheduled at 20,30 and 75 days of sowing and no nitrogen application. Increasing irrigation though reduced N content but the total N uptake was greatly increased. Application of nitrogen brought about significant increase in N content in seed and stover but total N uptake at 120 kg N/ha was at par with 160 kg N/ha showing thereby that N requirement of mustard under saline- sodic soil is satisfied at 120 kg N/ha.