Vol. 10, Issue 12 (2021)

Author(s):
Shivanand Goudra, Mudalagiriyappa, Hanumanthappa DC and Prakasha G

Abstract:
Nitrogen (N) nutrition in aerobic rice is gaining importance because of its role in increasing productivity and the large quantities of this major nutrient that are uptake by crop. A field experiment was conducted at Zonal Agricultural Research Station, University of Agricultural Sciences, Gandhi Krishi Vigyana Kendra, Bengaluru during kharif 2017 to improve yield, nutrient uptake and available nutrient status after harvest of aerobic rice as influenced by precision nitrogen management practices through crop sensors. Nitrogen nutrition was done based on sensor readings, which are taken for indexing nitrogen content in aerobic rice. The experimental results revealed that, significantly higher grain yield (7353 kg ha^-1) and straw yield (9151 kg ha^-1). Higher total nutrient uptake of nitrogen (135.8 kg ha^-1), phosphorus (23.04 kg ha^-1) and potassium uptake (117.7 kg ha^-1) were recorded with the application of nitrogen based on SPAD sufficiency index 96-100 per cent as compared to package of practices. After harvest of aerobic rice application of nitrogen based STCR for targeted yield of 8 t ha^-1 was recorded significantly higher soil available nitrogen (334 kg N ha^-1) and application of nitrogen based on SPAD threshold 35 recorded higher available phosphorus and potassium (36.41 and 209 kg P₂O₅ & K₂O ha^-1, respectively) compared to rest of the treatments.