Study of Optimum Time Span for Distinguishing Emp

Authors: Ramanjit Kaur Manpreet Jaidka P K Kingra

Publish Date: 2013/10/29

Volume: 84, Issue: 3, Pages: 625-633

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Abstract

Using the inherent spatial and temporal variability within a field to manage farm operations is called precision agriculture This is a sitespecific approach which can reduce input costs and results in higher crop productivity profitability and lesser environmental pollution Remote sensing provides a means for the development of weed maps by detecting the location of weeds within an agricultural field so that sitespecific/need based herbicide can be applied Reductions in herbicide use as a result of this practice reduce management costs for farmers and promote environmental friendliness The results revealed a decreasing trend in the number of tillers effective tillers number of grains per ear 1000grain weight and grain yield of wheat with increasing population densities of Rumex spinosus from 3 to 12 plants m−2 Highest grain yield of wheat 575 tonnes ha−1 was recorded under solid stand of wheat and lowest grain yield was recorded in treatments having 12 plants of R spinosus Higher radiance ratio and NDVI values were recorded in solid stand or pure wheat treatment and minimum under solid weed plots It was observed that by using radiance ratio and NDVI pure wheat can be distinguished from pure populations of R spinosus after 30 DAS It remains distinguished upto 120 DAS Different levels of Rumex populations can be discriminated amongst themselves from 60 DAS onwards

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