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Effectiveness of spraying with fertilizers for control of weeds on arable land

Singh, B.N., Das, K.
Agronomy journal 1938 v.30 no.6 pp. 465-474
grain crops, Chenopodium album, Anagallis arvensis, weeds, weed control, crop yield, NPK fertilizers, application rate
Replicated field experiments have been carried out to determine the effectiveness of ammonium sulfate, sodium nitrate, potassium sulfate, and superphosphate sprayed singly or in different combinations in controlling annual weeds abounding in a wheat crop (Pusa 4). The relative significance of the different treatments was judged by comparing the mean square roots of weed densities after spraying. Covariance method of statistical analysis has been applied to improve the precision of the experiment and to adjust the mean square roots of densities after spraying for the original weed density before spraying. The results with different treatments varied between 33% and 73% control of C. album and 42% tO 76% of A. arvensis. The treatments also gave significant increases in the yield of grain as compared to the control plats. The increase for the different treatments varied from 7% to 20% of the mean value of the control plats. The combination of ammonium sulfate, superphosphate, and potassium sulfate besides giving the best degree of control for both weed species also gave the maximum yield among all the treatments. These observations indicate that spraying with fertilizers may be advantageously used for the combined effect of reducing the weed density in cereal crops and of increasing the yield of the grain.