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上海郊区三麦的茬口迟,播种晚,麦苗冬前分蘖少,成穗率低,是影响三麦单产的一个重要因素。为了促苗早发,生产上采用春性较强的大元麦品种和增加施肥量。但肥料以挥发性氮肥氨水、碳铵为主,分次面施的挥发损失大,氮素利用率低。1978～1980三年,我们在总结群众经验的基础上,用盆栽试验、田间试验、室内分析和~(15)N标记等方法,开展了较系统的研究,并与市农资公司及有关县、社、队结合,开展多点试验和示范,现将试验结果分述如下。一、麦子的吸肥特点 1.不同产量水平所需养分量。据分析测定,大、小麦亩产600～700斤水平,每生产百
Shanghai suburbs of the three wheat stubble late, sowing late, less tillering wheat seedlings before winter, into a low ear rate, is an important factor affecting the yield of three wheat. In order to promote early seedling production, the use of spring greater strong varieties of wheat and increase the amount of fertilizer. However, the fertilizers used volatile nitrogenous fertilizer ammonia and ammonium bicarbonate as main pollutants, and the volatilization loss on the graded surface was large and the nitrogen utilization rate was low. From 1978 to 1980, on the basis of summarizing the experiences of the masses, we conducted a systematic study using the methods of pot experiment, field experiment, laboratory analysis and ~ (15) N marker, and conducted a systematic study with the municipal agricultural companies and relevant counties , Clubs and teams to carry out multi-point test and demonstration, the test results are summarized below. First, the absorption of wheat characteristics 1. The amount of nutrients required for different levels of production. According to the analysis and determination, large and wheat yield per acre 600 ~ 700 kg level, each producing 100