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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : The Effects of Field Ridging and Flat-Field Planting on Growth and Yield of Three Legumes Grown Before Rice in the Pre-Monsoon Season of Northeastern Thailand) ผู้เขียน: Anan Polthanee สื่อสิ่งพิมพ์:pdf AbstractField studies were conducted to assess the effects of field ridging and flat-field planting on the growth, yield and economic return of mungbean, cowpea and soybean grown before rice in the pre-monsoon season of Northeastern Thailand. The results showed that growth and yield of the 3 legumes were not significantly affected by field ridging. However, there was higher net income in flat-field planting treatments. This was attributed to high labour cost for ridge construction. Cowpea gave the highest seed yield with both field ridging and flat field planting treatments as compared with mungbean and soybean. In economic terms, however, soybean gave the maximum net return with flat-field planting treatments. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Growth, Yield Attributes, Yields, and Weed Characteristics as Influenced by Integrated Nitrogen Fertilization and Weed-Control Measures of Maize (Zea mays L.) in Central Rif ผู้เขียน:Girma WOLDETSADIK,  ดร.สมบัติ ชิณะวงศ์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractAn experiment was conducted during the rainy season of 2003 at Dera and Melkassa, to study the influence of nitrogen fertilizer levels and weed control measures on growth, yield attributes, yields, and weed characteristics of maize (Zea mays L.) under rainfed condition. The experimental treatments were split plot design, comprising four nitrogen fertilizer levels [N0, control, N1, 10, N2, 20, and N3, 30 kg N/ ha in main plots and four weed control measures [W0, weedy check, W1, atrazine/s-metolachlor at 3.0 kg/ ha (pre-emergence); W2, atrazine/s-metolachlor at 3.0 kg/ha + 2, 4-D at 1.0 kg/ha (pre + post-emergence); and W3, 2, 4-D at 1.0 kg/ha (post-emergence)] in sub–plots and were replicated thrice. Total biomass, straw yield, harvest index, plant height and lodging percentage were increased with an increase in N levels at both sites. Application of 30 kg N/ha was found helpful in reducing the dry matter accumulation by weeds probably because nitrogen requirement of weeds and crop was met at this level and crop could compete better with weeds due to increased growth. Leaf area increased with an increase in nitrogen, being maximum at 30 kg N and minimum in the control at Dera and Melkassa, respectively. Weed control measures not only increased the leaf area, yield attributes and the grain yield of maize but also decreased the weed population and dry matter of weeds. Suppression of weeds by weed-control measures resulted in better growth and development of maize. Weed population and dry matter production of weeds were effectively suppressed with pre and post-emergence application of atrazine/smetolachlor at 3.0 kg/ha + 2, 4- D at 1.0 kg/ ha increased the grain yield of maize by 13.4 % over control non-weeded. |
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