Influence of Precision Nitrogen Management through Crop Sensors onand Yield of Maize ilea mays L.)

摘要

Field experiment was conducted at Zonal Agricultural Research Station, UAS, GKVK, Bengaluru to assess the influence of precision nitrogen management through crop sensors on growth and yield of maize with twelve treatments and replicated thrice using RCBDduring khariflO 16. The results revealed that,growth parameters, like plant height (225.0 cm), number of leaves (15.37), leaf area and leaf area index (9839cm2 plant"1 and 5.47) and dry matter production (440.43 g plant1) were significantly higher whenNPK fertilizers were applied through STCR method for target yield of 111 ha~(-1) as compared to absolute control and other treatments. However, it was on par with NPK application through SSNM, GreenSeeker and SPAD sufficiency index 96-100 per cent. The treatment which receives STCR based NPK management for target yield of 11 t ha'recorded significantly higher number of cobs per plant (2.08), cob length and girth (21.10 cm and 7.06 cm),number of rows cob"1 (17.13), kernels row1 (42.30), kernels cob"1 (729), higher grain yield (HO.Slqha~(-1)) and straw yield (137.20 q ha~(-1)) compared to absolute control but it was on par with SSNM, GreenSeeker and SPAD sufficiency index 96-100 per cent. Higher gross returns and net returns (~ 1,91,650 ha~(-1) and 1,38,100 ha~(-1), respectively) were noticed in application of NPK fertilizers through STCR method for target yield of 111 ha~(-1) but higher B: C ratio (3.60) was registered in nitrogen management through GreenSeeker as compared to recommended dose of nitrogen as per package of practices and absolute control.