喷施硫酸钴对紫花苜蓿鲜草产量及品质的影响

采用叶面喷施的方法，研究了不同施钴水平对紫花苜蓿鲜草产量和营养品质的影响。结果表明：喷施硫酸钴显著（P＜0.05）提高了苜蓿鲜草产量，其中施钴量为300 mg/kg的处理效果最好，比对照CK产量可以提高25%。同时显著能够提高苜蓿叶茎比。不同施钴水平对苜蓿营养成分的含量影响不同，苜蓿粗蛋白及磷含量随随钴量的增加而增加，而对苜蓿粗纤维、粗灰分和无氮浸出物含量没有显著的影响，粗脂肪则随着施钴量的增加而逐渐降低。不同施钴水平对紫花苜蓿营养物质产量影响不同，其中粗蛋白、粗灰分、磷和无氮浸出物产量均以Co2处理300 mg/kg最高，都要显著高于对照，粗纤维、钙产量也以Co2处理最高，但与CK没有显著差异，粗脂肪产量则以Co1处理100 mg/kg效果最好

Effect of Leaf Surface Spurting Cobalt Sulfate on the Fresh Grass Yield and Quality of Alfalfa

The paper studied the effect of different level of cobalt sulfate on fresh grass yield and nutrient quality of alfalfa by leaf surface spurting. The result indicated that, Spurting cobalt sulfate could remarkably (P < 0.05) increase the fresh grass yield of alfalfa and the leaf stem ratio (LS). The effect of the concentration of 300 mg/kg treatment is best, in compared to CK treatment, the fresh grass yield increased by 25%. Different levels of cobalt sulfate affect the nutrient content differently. The contents of crude protein (CP) and P was increased with the applied Co amount increased, while there was on significantly different on content of crude fiber (CF), nitrogen free extract (NFE), crude ash (CA), and the content of crude fat (CF) was decreased with the applied Co amount increased. When the Co concentration was 300 mg/kg, the yield of crude protein (CP), crude ash (CA), P, NFE was reach max., among the all of treatment, and significantly higher than that of CK treatment, the yield of crude fiber and Ca of treatment Co2 was reach max., but there were no significantly different to CK. and crude fat was Co1 treatment.