Studies on cultural practices for sunflower (Helianthus annus L.) grown after wetland rice
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Date
1988
Authors
Aye Thaw
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Abstract
Three field experiments were conducted on a Maligaya clay to determine the yield performance of sunflower grown after wetland rice as affected by tillage and fertilizer level (Experiment 1), irrigation frequency and plant density (Experiment 2), and intercropping with field legumes (Experiment 3). The experiments were undertaken at the College of Agriculture Experimental Area, Central Luzon State University, during the dry season, crop year 1987.
Both tillage and fertilizer treatments significantly affected the yield performance of sunflower. Maximum tillage produced significantly higher seed yield ()2.34 t/ha) than medium (2.12 t/ha) and minimum (1.90 t/ha) tillage operations. Application of 120 kg N/ha was needed to obtain optimum yield of 2.40 t/ha. At each level of N, application of P and K at the rate of 60 kg/ha did not further result in higher seed yield.
The yield performance of sunflower was also markedly affected by irrigation frequency and plant density. Regardless of plant density, plants irrigated six times had significantly higher seed yield than those irrigated four times. Plants grown at 53, 333 plt/ha and irrigated six times increased the seed yield by 43.79% compared to plant density of 44,444 plt/ha and irrigated four times.
Intercropping field legumes such as mungbean, cowpea, and soybean did not affect the yield peerformance of sunflower. The seed yield of these field legumes was significantly reduced in an intercropping system as compared to monocropping system. The seed yield reduction was 93.79% for mungbean, 107.48% for cowpea, and 139.41% for soybean.