Author(s):

Jyothsna K, J Padmaja, Dr. D Sreelatha, Dr. R Mahender Kumar and Dr. A Madhavi

Abstract: A field study was conducted during Kharif 2019-20 at Professor Jayashankar Telangana State Agricultural University, Rajendranagar, Telangana, India to study the nutrient management in hybrid maize (Zea mays L.) using simple hand-held decision support tools viz., LCC, SPAD and Green seeker. Treatments consisted of state recommended nitrogen @ 200 kg ha^-1 in three splits, Leaf Colour Chart (LCC) based N application at threshold 3 and 4, SPAD chlorophyll meter based N application at threshold 35 and 40 and Green Seeker based N application at NDVI value 0.6 and 0.8 compared with absolute control and RDN. The field experiment was conducted in Randomized complete block design with three replications. The results of the field study revealed that application of nitrogen-based on Green Seeker NDVI at threshold 0.8 recorded significantly higher maize grain (8408 kg ha^-1), and stover (9923 kg ha^-1) yields with higher N uptake of 225.5 kg ha^-1 .Further, among different precision nitrogen management practices, significantly higher Partial Factor Productivity (57.8 kg kg^-1), Recovery Efficiency (99.7%), Agronomic Efficiency (25.7 kg kg^-1) were obtained in nitrogen management through SPAD based N at threshold 40 as compared to recommended dose of nitrogen and absolute control.

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