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Assessing Stylo (Stylosanthes hamata cv. Verano) for Fodder in Semi-arid Nigeria: 1. Effects of Sowing Methods on Growth and Herbage Yield
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《Journal of Agricultural Science and Technology(B)》 2012年第5期519-526,共8页
Field experiments were conducted at Dabagi Farm of the Usmanu Danfodiyo University, Sokoto (13~I'N and 5~15' E), in the Semi-arid of Nigeria, during 2007 and 2008 rainy seasons to determine the effect of sowing me... Field experiments were conducted at Dabagi Farm of the Usmanu Danfodiyo University, Sokoto (13~I'N and 5~15' E), in the Semi-arid of Nigeria, during 2007 and 2008 rainy seasons to determine the effect of sowing methods on growth and fodder yield of Stylosanthes hamata cv. Verano. Three sowing methods (dibbling, broadcasting and drilling) were investigated. The experimental design adopted for the study was the randomized complete block design (RCBD) replicated three times. The parameters monitored included plant height (cm), leaf length (cm), leaf width (cm), number of leaves, canopy spread (cm), stand count and herbage yield. Samples were randomly taken and marked for the measurement of the parameters at 2, 4, 6, 8, 10, 12 and 14 weeks after sowing (WAS). Herbage yield (kg hal) was determined at the end of the 14th week. Result of the study revealed that the sowing methods had significant effect (P 〈 0.05) on growth parameters at 2 to 14 WAS in 2007, 2008 and in their combined analysis. Dry matter yield differed (P 〈 0.05) significantly. Dibbling method produced plants that were taller, longer, with wider canopy spread and leaves as well as more leaves and stands (P 〈 0.05). The year 2007 produced taller plants, longer, wider canopy spread and leaves as well as more leaves and stands (P 〈 0.05) in all the weeks compared to the year 2008. It was therefore concluded from the results of this study that dibbling method of sowing was the best for Stylosanthes hamata cv. Verano production at 50 ~ 50 cm inter and intra-row spacing in the semi-arid of Sokoto agro-ecology in northwestern Nigeria, presumably due to low competition for scarce moisture and creation of more space in this sowing method. 展开更多
关键词 FODDER sowing methods Stylosanthes hamata semi-arid.
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贝克水蚤对水华鱼腥藻的同化速率及其对藻丝数量的影响 被引量:1
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作者 徐振康 C.W.布恩斯 《水生生物学报》 CAS CSCD 北大核心 1992年第3期208-214,共7页
在实验室条件下对贝克水蚤同化利用丝状蓝藻和控制藻丝数量的能力进行了测定。当喂以水华鱼腥藻和对照食物沼泽卵形隐藻的单种培养时,三节贝克水蚤和钩状贝克水蚤的雌性成体均可同化利用水华鱼腥藻,但与隐藻相比同化速率较低。三节贝克... 在实验室条件下对贝克水蚤同化利用丝状蓝藻和控制藻丝数量的能力进行了测定。当喂以水华鱼腥藻和对照食物沼泽卵形隐藻的单种培养时,三节贝克水蚤和钩状贝克水蚤的雌性成体均可同化利用水华鱼腥藻,但与隐藻相比同化速率较低。三节贝克水蚤的雌性成体能够明显地减少鱼腥藻藻丝密度,即使在有相同生物量的隐藻存在的情况下也一样。这些结果与我们关于贝克水蚤利用丝状蓝藻的能力的其他研究的结果相一致。 展开更多
关键词 鱼腥藻 同化速率 藻丝 贝克水蚤
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