Effects of fertilizers and sowing rates on growth characteristics and forage yields of alfalfa in Yangzhou region | 施肥和播种量对扬州地区苜蓿生长特性和产草量的影响
2012
Pan Ling, Yangzhou University, Yangzhou (China), College of Animal Science ＆ Technique, Institute of Forage and Grassland Science | Wei Zhenwu, Yangzhou University, Yangzhou (China), College of Animal Science ＆ Technique, Institute of Forage and Grassland Science | Wu Zinian, Yangzhou University, Yangzhou (China), College of Animal Science ＆ Technique, Institute of Forage and Grassland Science
chinois. 用裂区试验设计研究扬州地区苜蓿(Medicago sativa)不同播种量和施肥水平对产草量及生产性能的影响。结果表明：江淮地区苜蓿推荐播种量为18.75kg/hm2, 氮、磷、钾推荐施用量分别为23, 113, 68kg/hm2时, 此时苜蓿的理论产草量可达22858.25kg/hm2。单独施用氮、磷、钾肥时, 在一定范围内对苜蓿产草量有促进作用, 但当超过最大施用量时, 对苜蓿的生长反而造成抑制。建议氮肥施用量不超过30kg/hm2, 磷肥施用量不超过130kg/hm2。氮、磷、钾共同施用时苜蓿产草量才能达到最大值;氮肥在苗期、分枝期和初花期对苜蓿植株生长均有一定的促进作用;磷肥促进苜蓿主枝数的增加, 氮钾肥有利于苜蓿侧枝数的生长。
Afficher plus [+] Moins [-]anglais. The optimum application rates of nitrogen (N), phosphorus (P), potassium (K) and sowing rates on forage yield of alfalfa (Medicago sativa L. ) were determined in this study. A randomized spilt-plot was designed with three replications. Results indicated that a maximum yield (22858.25 kg/hm2) was obtained with N 23, P 113, K 68 kg/hm2 fertilizers and 18. 75 kg/hm2 sowing rate in the field experiment of Yangzhou. Forage yields were improved by applying N, P, K fertilizer separately within proper application rates. N, P, K over-application was a negative influence on the forage quality of alfalfa. The limited levels of N and P fertilizers were 30 and 130 kg/hm2. N fertilizer promoted plant growth at sowing stage, branching stage and initial flowering stage. P increased the number of branch. K increased the number of sub-branch.
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