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为了贯彻落实“种草种树,改造山河,治穷致富”的方针,在今后一个相当长的时期内,大力发展苜蓿生产,将是陇东旱塬农牧业生产的一项战略措施。一、苜宿在陇东旱农牧业生产中的作用紫花苜蓿在陇东旱塬有悠久的种植历史和传统的栽培经验,是当地一种古老的栽培牧草。50—60年代,苜蓿在陇东栽培面积占耕地面积的10％左右,对发展农牧业生产起了重要作用。苜蓿根系着生根瘤,可以固氮,一亩苜蓿可固氮素17—27斤,相当于85—130斤硫铵。据我站在董志塬取0—30厘米土化验,二年生苜蓿地每亩全氮比一般田增加54斤;五年生增加
In order to implement the policy of “planting trees and grass, rebuilding mountains and rivers and managing poverty and becoming rich”, it is a strategic measure to develop alfalfa vigorously for a fairly long period of time in the future. First, the role of alfalfa in dry farming in the eastern part of Gansu Alfalfa has a long history of planting and the traditional cultivation experience in the eastern Gansu Plateau. It is an ancient cultivated forage in the area. 50-60 years, alfalfa cultivation area in eastern Gansu accounted for about 10% of arable land, the development of agriculture and animal husbandry production has played an important role. Alfalfa root nodules, nitrogen fixation can be a mu of nitrogen-fixing alfalfa 17-27 pounds, equivalent to 85-130 kg ammonium sulfate. As I stood in Dongzhi plateau to take 0-30 cm soil test, two-year alfalfa total nitrogen per mu than the average field increased 54 pounds; five-year increase