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4个酸性水稻土施用不同磷源的试验结果显示 :(1)水稻土施用磷肥的增产效应 ,油菜比水稻大得多 :发育第四纪红色黏土红壤稻田 (有效磷含量 6 .3mg/ kg)施用磷肥增加油菜籽 13.7～ 2 2 .2倍 ,而发育于河流冲积物和红砂岩的水稻土 (有效磷含量 10 .8mg/ kg)施用磷肥增加油菜籽 2 .6 8～ 3.6 3倍 ;发育第四纪红色黏土和花岗岩的红壤稻田施用磷肥增加稻谷产量分别为 1.4 %～ 3.8%和 3.5 %～ 7.3% ;(2 )红壤水稻土施用 Gafsa磷矿粉农学相对有效性 (86 .2 %～ 10 4 .7% )与过磷酸钙相近 ,而大大高于昆阳磷矿粉 (47.2 %～ 6 4 .5 % ) ;(3)油菜施用磷肥增加的产值 (2 839～ 5 30 7元 / hm2 )显著高于水稻施用磷肥增加的产值 (2 2 4～ 74 2元 / hm2 ) ;(4)油菜和水稻施用磷肥的产投比昆阳磷矿粉 >Gafsa磷矿粉 >过磷酸钙 ;(5 )在施磷矿粉的基础上 ,施用硫肥可使油菜籽产量提高 8.4 %～ 19.5 % ,而稻谷产量仅提高 1.6 %。
The results showed that: (1) The yield-increasing effect of applying phosphate fertilizer on paddy soil was much larger than that of rice: the Quaternary red clay paddy soil (effective phosphorus content 6.3 mg / kg) Phosphorus fertilizer increased the rapeseed by 13.7-2.22 times. Phosphorus fertilizer developed in paddy soils with alluvial sediments and red sandstone (effective phosphorus content: 10.8 mg / kg) increased rapeseed from 6.86 to 3.6 times. Development Quaternary red clay and granite red soil paddy fields increased phosphorus application rates by 1.4% -3.8% and 3.5% -7.3%, respectively; (2) Agronomic efficiency of Gafsa phosphate rock in paddy soils (86.2% ~ 10 4 .7%) was similar to that of superphosphate, but much higher than that of Kunyang phosphate rock (47.2% ~ 64.5%); (3) The increased output of phosphorus fertilizer with rape (2883-5307 yuan / hm2) was significantly higher than that of paddy rice (224 ~ 742 yuan / hm2); (4) The production of phosphate fertilizer for rapeseed and rice was higher than that of Kunyang phosphate rock> Gafsa rock phosphate> superphosphate; (5) On the basis of applying phosphate rock, the application of sulfur fertilizer can increase the yield of rapeseed by 8.4% ~ 19.5%, while the output of paddy increased by only 1 .6%.