Studies on available sulphur status and groundnut response in coastal alluvial soils of Nellore district (A.P.)

摘要

Alluvial soils where groundnut is grown in Nellore district of Andhra Pradesh, were studied for their sulphur status. The total sulphur content of the soils ranged from 104 to 166 ppm with a mean of 130.3 ppm. The studies of the soils under green house conditions revealed that sulphur application significantly increased the drymatter yield and sulphur uptake of groundnut plants at 30 and 60 DAS. Sulphur had a synergistic effect on absorption of N,P and K by goundnut. The available sulphur extracted with 0.15% CaCl_2, 1% NaCl and N NH_4OAc pH (7.0) was positively and significantly correlated with drymatter yield and sulphur uptake by groundnut at 60 DAS of the crop growth, indicating that any one of the extractants could be used for predicting the available sulphur status of soils of Neltore district.