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“广陆矮4号”是我省推广的早稻当家良种。在现有用肥水平的情况下,用硫酸铵给它追肥,什么时期追施能发挥最大的经济效益呢?为此,我们进行了试验。现把试验情况和结果简介于下:一、试验情况试验田土质较粘,土壤肥力中等,前作为红花草子。“广陆矮4号”于3月28日播种,塑料薄膜育秧,5月5日带土移栽。追肥量为每亩硫酸铵30斤。分4种处理:(1)追肥平衡施:于分蘗期、幼穗分化期和孕穗期各施10斤。(2)重施分蘗肥:分蘖期施20斤,幼穗分化期施10斤。(3)重施幼穗分化肥:幼穗分化期施20斤,孕穗期施10斤。(4)重施孕穗肥:幼穗
“Guanglu Dwarf No. 4” is promoted in our province as a good early rice varieties. In the case of the existing level of fertilizer, ammonium sulfate to its top dressing, when the chase can play the greatest economic benefits? To this end, we conducted a test. Now the test conditions and results outlined in the following: First, the experimental conditions Tien soil more sticky, medium fertility, before as safflower grass. “Guanglu Dwarf No. 4” sown on March 28, plastic film seedlings, on May 5 with soil transplanting. Dressing amount of 30 kg per acre ammonium sulfate. Divided into 4 kinds of treatment: (1) topdressing balance Shi: at the tillering stage, panicle differentiation and booting 10 kg each. (2) re-applied tillering fertilizer: 20 kg at the tillering stage, panicle spawning 10 kg. (3) re-fertilization of young spike fertilizer: young panicle Shi Shi 20 pounds, booting Shi Shi 10 pounds. (4) heavy bumper fertilizer: young spike