Upland Rice Performance through N, P, K Fertilizers and Weed (Mimosa invisa L.) Extract Applications.
Weed may be defined as plants or vegetation that interferes with the farming systems. However, using weeds as a natural resource to support crop production is still unexplored. Mimosa invisa is one of the main weeds of dry land with a wide distribution level. Therefore, the utility of this weed is expected to increase the efficiency of using synthetic fertilizers to gain optimal production. The objective of this study was to determine the effect of N, P, K fertilizers, and weed (Mimosa invisa L.) extract on plant growth and physiological characters and yield of upland rice. A split-plot design with the main plot of N, P, K fertilizer dose viz. 50% N, P, K and 100% N, P, K and subplot of weed extract viz. concentration of 0%; 1.25%; 1.67%; 2.5% and 5% were tested. Each treatment was replicated three times. Observed variables were growth characters, i.e., plant height, leaf area, shoot dry weight, root dry weight, physiological characters, i.e., proline, chlorophyll a, chlorophyll b, N and P contents in rice shoot, and yield components, i.e., the number of productive tillers, weight of grain hill-1, number of grains hill-1, the weight of 1000 seeds, percentage of filled grains, the weight of grain ha-1. The results showed that 5% weed extract improved plant height, leaf area, shoot P content, grain weight ha-1, and increased efficiency in N, P, K fertilizer application, and high N shoot content.
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