东北农牧交错带种植苜蓿与玉米综合效益研究

研究表明种植苜蓿当年干物质量仅为玉米干物质量的48.8%,而粗蛋白质量较玉米高66.3%,其投入及产出均低于种植玉米,其净产值与种植玉米接近;0~30cm土层内苜蓿根干物质量为玉米的3.06倍,苜蓿地土壤容重、孔隙度分别为玉米地的95.53%和104.81%,pH较玉米地下降0.1;0~20cm土层内苜蓿地土壤有机质、碱解氮和速效磷含量均低于玉米地,速效钾含量则高于玉米地;春季苜蓿地土壤风蚀量仅为玉米地的41.81%。

Comparison of comprehensive benefits between alfalfa and corn in agriculture-pasture ecotone in the Northeast China

A field experiment was conducted to compare the comprehensive benefit of alfalfa with that of corn in Tongliao in Inner Mongolia. The results show that the dry matter yield of alfalfa is only 48.8 % of that of corn , while the crude protein yield of alfalfa is higher than that of corn with 66.3 %. Although the input and output values of alfalfa are both lower than those of corn ,the net output values of them are nearly equivalent. The dry root weight of alfalfa is 3.06 times of that of corn,bulk density and porosity of alfalfa field are 95.53 % and 104.81% of those of corn field respectively in 0- 30cm soil layer. The organic matter, alkaline hydrolysis N,available P and pH of alfalfa field are all lower than those of corn field, while available K is higher than corn field in 0 - 20cm soil layer. The deflation of alfalfa field is only 41.81% of that of corn field in spring.