小麦拔节是营养生长与生殖生长旺盛时期的重要标志。在此前几天追施拔节肥,能提高产量。例如,1960—1961年我們試驗,品种为南大二四一九,3月20日拔节,在拔节前的3月16日每亩追施硫酸銨十斤、过磷酸鈣二十斤,結果亩产四百六十七点四斤,較不施的亩产四百三十点四斤增产8.6%。1961—1962年試驗,品种为吉利麦,3月19日拔节,于拔节前的3月2日每亩追施硫酸銨十斤,結果亩产三百五十六斤,比不施的亩产三百三十九点六斤增产4.8%。施拔节肥为什么能增产?它对小麦的生育起着怎样的影响?作者就1961—1962年試驗結果来說明这个問題。合肥地区自3月上旬以后,气温逐漸升高,小麦一般都在3月上旬到中旬先后进入拔节期。进入到拔节期,标志着它与前期生 Jointing wheat is an important symbol of vegetative and reproductive growth. A few days ago dressing fertilizer, can increase production. For example, from 1960 to 1961, we experimented with varieties of Nanda 2419 and jointed the plants on March 20, and ten kilograms of ammonium sulfate was topdolished on March 16 before jointing. Producing 467.4 pounds, an increase of 8.6% over the output of 430.34 tons. 1961-1962 test, the varieties of auspicious wheat, jointing March 19, before the jointing on March 2 per acre topdressing ten kilograms of ammonium sulfate, the result of mu yield of 366 pounds, not than the application of mu Produce 339.6 kg yield 4.8%. Why did Shijiazhai Fertilizer increase production? How does it affect wheat’s fertility? The author illustrates the problem with the 1961-1962 test results. Hefei area since early March after the temperature gradually increased, wheat are generally early in mid-March to join the jointing period. Into the jointing period, marking it with the pre-students