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小麦从播种至出苗,完全依靠种子中储藏的养分营自养生活.出苗以后,长出绿色部分,开始由自养生活转入异养生活.到三叶期,种子里的养分消耗殆尽,即完全进入异养生活;同时分蘖节开始分化蘖芽,陆续伸出地面,进入分蘖期.因此,在三叶期追施矿质肥料,对小麦冬前分蘖的生长,功能器官——根和叶的成长、物质积累、组成和分配都有密切关系.一、研究方法试验是于1960—1961年在保定市郊河北省农业料学院附属农业试验场大田上进行的.土壤质地为砂壤土,前茬为玉米,耕翻后不施基肥.选用品种为小麦碧玛4号,10月5日播种,播种密度25万粒/亩,实出苗20万株/亩.小区面积4×5平方米,顺序排列,重复三次.于三叶期进行矿质肥料追肥,处理项目如
Wheat from sowing to emergence, relying solely on nutrition stored in the seed camp self-supporting life.After emergence, grow green part, began to turn heterosexual life from autotrophic life.To the three-leaf stage, the seeds of nutrients consumed, That is, completely into the heterotrophic life; at the same time the tillering node differentiation tiller bud, one after another out of the ground, into the tillering stage.Therefore, topdressing mineral fertilizer in the clover stage, the growth of winter wheat tillers, functional organs - roots and leaves Of the material accumulation, composition and distribution are closely related.First, research methodsTest was in 1960-1961 in Baoding suburbs of Hebei Agricultural College agricultural experiment field field.The soil texture is sandy loam, the former crop For corn, after the tillage, no basal fertilizer was applied.The wheat variety Bimai 4 was chosen and sown on October 5, with a planting density of 250,000 grains / mu and seedlings of 200,000 trees / mu. The area of the plot was 4 × 5 square meters, Arranged, repeated three times. In the three-leaf stage mineral fertilizers fertilizer, treatment projects such as