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(一)磷硫钙质肥料沾秧根的效果分析 赣南花岗岩山区冷浸性低产田主要有两大类型。一类是锈水田,其特点是排水不畅,泥脚较深,水土温度均低,还原过程占优势,有机质积累较多,同时还出锈水,即土壤中过量的亚铁经氧化后形成高铁胶膜浮在田面上,对水稻幼苗生长发育过程起着毒害作用,插秧后10天左右才能返青,分蘖迟而且少,穗短而较少,产量低。另一类是返黄田,主要分布在垅田的上部或山麓低排田,为花岗岩风化残积物掩盖生成的土层,分布于地势较低的返黄田,局部地段有泉眼(暗泉)出现,保持着地下水位的通路。因此,在这些部位水稻移栽后25天左右出现叶色退黄,即所谓间花返黄现象,这一现象与陷湖田的局部返黄其本质是相同的。但因表
(A) Analysis of the effect of Phosphorus-sulfur Calcium Fertilizers on the root of dip-cold There are mainly two types of cold-soaked low yield fields in granite mountainous areas of southern Jiangxi. One is the rust paddy field, which is characterized by poor drainage, deep mud feet, soil and water temperature are low, the reduction process is dominant, more organic matter accumulation, but also rust, that is, excess iron in the soil after oxidation formed High-speed iron film floating on the surface of the field, the growth and development of rice seedlings play a toxicological role, 10 days after transplanting to rejuvenate, late and late tillers less spike short and less, low yield. The other is Huangtian, which is mainly distributed in the upper part or the lower part of the foothills in Gaotian. It covers the formed soil layer for the granite weathering residue and distributes in the low-lying Huangtiantian. There are springs (dark springs) in some areas, Maintain the groundwater level access. Therefore, in these areas about 25 days after transplanting rice leaf color back to yellow, the so-called inter-flowering back to yellow phenomenon, and the phenomenon of subsidence Hutian Lake local yellow is essentially the same. But because of the table