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种牧草比种玉米效率高数倍。中国社会科学院世界经济与政治研究所研究员刘振邦指出,在人类所经营的农作物中,种草的光合效率最高。以多年生紫花苜蓿草为例,干草粗蛋白含量高达24%～26%,按亩产1500kg干草计算,亩产粗蛋白近400kg。如果种谷物,年平均亩产按700kg计算,乘上8%的蛋白率,仅合56kg,加上秸秆也超不过70kg粗蛋白。种草获取的生物量是种谷物的5~8倍,如果种3亿亩紫花苜蓿,按最低产量计算,其生物产
The forage grass is several times more efficient than the kind of corn. Liu Zhenbang, a researcher at the Institute of World Economics and Politics of the Chinese Academy of Social Sciences, pointed out that among the crops run by mankind, the photosynthesis efficiency of planting grass is the highest. Taking perennial alfalfa as an example, the crude protein content of hay is as high as 24% ~ 26%. Calculated according to 1500kg of hay per mu, nearly 400kg of crude protein per mu is produced. If the kind of grain, the average yield per 700kg calculated by multiplying the protein rate of 8%, only about 56kg, plus straw also exceeds 70kg of crude protein. The biomass of the grass is 5 to 8 times that of the cereals, and if the 300 million acres of alfalfa are planted in the lowest yield, the biomass