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为了探讨涂层尿素在棉花上施用的效果,正定县土肥站于1991—1993年进行了涂层尿素与普通尿素肥效的示范对比试验,结果证明:一、在同等地力条件下,亩施同等数量的涂层尿素与等氮量谱通尿素相比,前者平均亩产籽棉165.6公斤,后者为156.4公斤,亩增籽棉9.2公斤,增产5.8%。同时施用涂层尿素与等氮量普通尿素处理的土壤硝态氮含量虽持平,但施用涂层尿素的土壤铵态氮却提高了2.03PPM,起到了防止氮素消失,降低硝化作用速度,提高氮的利用率等作用。另据生育期间观察,施用涂层尿素处理的棉花叶片浓绿,前期长势稳健,后劲长,可有效防止棉田高产早衰现象的发生。二、涂层尿素在棉花上的适宜用量,以亩施纯氮14.22 16.15公斤,磷肥3.46—6.9公斤效果较好。三、在施用方法上,涂层尿素在壮地施用,宜采用底施1/3、追2/3的方式较好,但追肥时期应适当提早几天,这是因涂层尿素的肥效稳而长的缘故。在一般地力上施用,则以底追各半为宜。
In order to investigate the effect of coated urea on cotton, the demonstration test of fertilizer efficiency of coated urea and ordinary urea was carried out in 1991 to 1993 in Chengde County Soil Fertilizer Station. The results show that: 1. Under the same conditions of soil fertility, Of the coated urea and isoniazid compared to nitrogen, the former average yield of 165.6 kilograms of seed cotton per mu, which is 156.4 kg, an increase of 9.2 kg of seed cotton, an increase of 5.8%. In the same time, the content of nitrate nitrogen in soil treated with coated urea and normal nitrogen was equal, but the content of ammonium nitrogen in soil with coated urea increased by 2.03PPM, which prevented the loss of nitrogen, reduced the rate of nitrification and increased Nitrogen utilization and so on. According to observation during the growth period, cotton leaves treated with coated urea were dark green with stable growth in the early stage and long stamina, which could effectively prevent the occurrence of premature high-yielding in cotton field. Second, the appropriate amount of urea coating on cotton, with Mushi nitrogen 14.22 16.15 kg, phosphate fertilizer 3.46-6.9 kg better. Third, in the application method, coated urea in the strong application, should adopt the bottom of 1/3, chase 2/3 is better, but the top dressing should be properly a few days earlier, which is due to coated urea fertilizer efficiency And long sake. Applied in the general force, the end chase half is appropriate.