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根据現有的試驗材料看来,在江苏省农业区磷肥有明显功效的是宜兴、溧阳、金坛、高淳的酸性土壤,特别是这些地区的旱作区。在一般农家施肥情况下,加施过磷酸鈣或鈣鎂磷肥,通常得到显著的增产效果。此外,里下河地区的沤田,在新种旱作的最初2-3年,加施过磷酸鈣也有显著的增产作用。就苏北石灰性土壤及苏常地区高度熟化的高产土壤来讲,在現有的施肥制度下,对小麦、玉米、水稻等作物直接施用过磷酸鈣,增产效果通常不明显。但是很多結果表明:在用过磷
According to the existing experimental materials, it seems that the obvious effect of phosphate fertilizer in agricultural areas in Jiangsu Province is the acid soil in Yixing, Liyang, Jintan and Gaochun, especially in these areas. In the case of general farm fertilization, plus the application of calcium phosphate or calcium magnesium phosphate, usually a significant increase yield. In addition, Luda in the Lixiahe area also had a significant increase in production of calcium phosphate in the first 2-3 years of the new planting drought. With regard to calcareous soils in North Jiangsu and highly-matured high-yielding soils in the Soviet Union, under the existing fertilization system, the direct application of superphosphate to crops such as wheat, corn and rice is not obvious. However, many results show that: in the use of phosphorus