黑龙江省查哈阳农场(甘南县境内)1987年开始在新立分场四队9450亩贫瘠土壤上种植多年生紫花苜蓿,实行牧草粮食作物轮作,改良土壤。收到较大的增产和增值效应。现在农场种植紫花苜蓿面积已扩大到2.8万亩。一、实行粮草轮作发展奶牛业新立分场四队是以开垦草原发展起来的以种植业为主的农业生产队。由于连年耕种不施有机肥料,造成地力逐年下降,种植业单产越来越低。由于土壤贫瘠,抗御自然灾害的能力越来越差,因此将低产土地退耕还牧,种植多年生紫花苜蓿草,实行粮草七区轮作:即现有耕地10290亩,把其中的9450亩分为 Chahayang Farm in Heilongjiang Province (in Gannan County) In 1987, perennial alfalfa was planted on 9,450 mu of poor soil in the fourth branch of Xinli Sub-district, and crop rotation was carried out to improve the soil. Received a larger increase in output and value-added effects. Now planted alfalfa farm area has been expanded to 2.8 million mu. First, the implementation of the development of grain and rolling wheel Dairy New Division four team is to develop reclamation of the grassland to the farming industry-based agricultural production team. As successive years of cultivation do not apply organic fertilizer, resulting in decline in fertility year by year, planting yield is getting lower and lower. Due to the poor soil and the ability to resist natural disasters, the low-yielding land was returned to cropping and grazing, and the perennial alfalfa was planted. Crop rotation was carried out in seven districts: 10290 mu of existing cultivated land and 9450 mu of them