兴化市位于江苏省腹部里下河地区洼底,60年代成功地“沤改旱”脱沼泽化后,迅速建立了稳定的水旱两熟制。20多年来,该市连年增施磷肥,但最近的土壤普查和田间试验结果表明,土壤仍普遍缺磷,作物对磷肥反应很显著。1985～1986年我们在该市钓鱼乡丁庄村和老圩乡有家村的两种土壤上,分别设置氮磷2因素5水平完全实施的试验方案,探讨小麦和水稻的肥料效应和经济效益。 Xinghua City is located in the lower reaches of the Lixiahe area in the belly of Jiangsu Province. After the swamp was successfully completed in the 1960s, Xinghua City quickly established a stable water and drought two-crop system. Over the past 20 years, the city has been increasing its use of phosphate fertilizers year after year, but recent soil censuses and field trials show that the soil is still generally deficient in phosphorus, and the crop response to phosphate fertilizer is significant. From 1985 to 1986, we experimented on two kinds of soils, Dingzhuang village and Xiangjia village, Laoxu town, Diaoyu town in the city, respectively, and set up the experiment program of full implementation of nitrogen and phosphorus level 2 and 5 respectively to discuss the fertilizer effect and economic benefit of wheat and rice.