Response of upland rice varieties to nitrogen fertilization and intercropping
1995
Jaballa, O.R.
Application of nitrogen [N] fertilizer increased leaf area index, leaf area duration, total dry matter yield, length of panicle, number of filled grains per panicle, number of panicle per square meter, and grain yield per hectare of upland rices. Harvest index [HI], however, declined with N fertilization. The five upland rice varieties vary significantly in terms of total DMY [dry matter yield] at harvest, number of days from sowing to heading and to maturity, length of panicle, plant height, yield components and grain yield. UPL Ri7 had the highest yield. Among the traditional varieties, Malidu and Hinamot had significantly higher grain yield than Azucena and Bihod. UPL Ri7 responded positively to the application of 120 kg N/ha while the traditional varieties responded well to 40 kg N/ha. Intercropping upland rice with legume significantly decreased net assimilation rate, crop growth rate, dry matter accumulation, plant height, length of panicle, HI and grain yield. On the other hand, upland rice intercrop did not significantly influence the physiological characters and yield components of intercropped mungbean and pigeonpea. Significant differences between the monocrop and intercropped legumes was, however, observed in terms of absolute grain yield. Intercrop treatments obtained higher combined LAI two weeks earlier than the monoculture. The intercrops also gave higher yields per unit land area than the sole crop. Land equivalent ratio of the intercrops ranged from 1.07-1.56. Productivity advantage of the intercrops over that of the monocrop ranged from 7-56 percent
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