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合理的施肥,有利于提高苜蓿种子的产量。试验就在新疆特殊的自然环境条件下对苜蓿种子生产的施肥问题进行了进一步的研究,目的探明在荒漠绿洲过渡带农作区苜蓿种子生产对肥料的需求规律。试验方法为:采取首先测定出所有小区土壤耕层中氮(N)、磷(P)的含量,然后根据土壤N、P肥含量的亏盈进行补充。研究结果表明,施用单纯的速效磷(P2O5),对制种苜蓿增产效果不大,过量使用会降低种子产量;少量施尿素对制种苜蓿有一定的增产作用,若施肥量超过120 kg/hm2时苜蓿枝条细长,生殖生长变弱而造成种子减产;磷酸二铵对制种苜蓿有明显的增产作用,是制种苜蓿最为适合的复合肥料,最佳施肥量为300 kg/hm2。
Reasonable fertilization is conducive to raising the yield of alfalfa seeds. In the experiment, the fertilization problem of alfalfa seed production was further studied under the special natural environment in Xinjiang, and the purpose was to find out the law of demand for fertilizer for the alfalfa seed production in the farming area of the desert oasis transitional zone. The test method is as follows: First, determine the content of nitrogen (N) and phosphorus (P) in the topsoil of all communities, and then supplement the deficit based on the content of N and P in the soil. The results showed that the application of simple available phosphorus (P2O5) had little effect on the yield increase of alfalfa. Excessive application of P2O5 could reduce the seed yield. A small amount of urea application could increase the yield of alfalfa. If the amount of fertilization exceeded 120 kg / hm2 The alfalfa shoots were slender and reproductive growth was weakened and the seeds were weakened. Diammonium phosphate had a significant increase in yield of alfalfa, which was the most suitable compound fertilizer for alfalfa. The best fertilizer was 300 kg / hm2.