National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Nitrogen management strategies developed so far are mainly based on soil tests targeted yield and generally N recommendations are made for large areas which certainly do not take into account the field to field and season to season variability. Nitrogen being the most dynamic nutrient, we have to develop real time N management strategies which are meant by applying the N doses to the crop as and when needed. Normalised difference vegetation index (NDVI) based on canopy reflectance in near-infra red and red spectral band is a potential tool to assess N status as well as crop growth vigour in terms of dry matter accumulation, leaf area index and to estimate of the in-season yield potential, thereby assessing the N requirement. Total dry matter at different crop growth stages was determined from destructive sampling. Leaf area index and plant height were also measured at different crop growth stages. NDVI values were collected using GreenSeeker optical sensor. Grain yield from each treatment was measured at harvest. NDVI predicted crop growth traits at 90 DAS more closely as compared to other stages generally and predictive capacity for LAI was more than that for dry matter accumulation. In-season yield estimation was also better at later stages as compared to earlier stages.
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