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近些年来,仁寿县在酸性土上施用钙镁磷肥,无论水稻或旱粮均获得较好的增产效果,但是在钙质紫色土上施用则增产效果不大。1980年土壤普查测定,速效磷含量属低值,稻田速效磷含量(0.5M NaHCO_3浸提)小于10ppm的占80.7％,早地速效磷更缺,小于10ppm的占96.7％。随后在紫色土区进行了施过磷酸钙的试验示范,其结果是:在蓬莱镇组紫泥上,小麦亩施磷酸钙50—60斤,比对照增产25.1％,水稻亩施过磷酸钙40斤增产16.1％;在自流井暗紫泥上(中
In recent years, Renshou County in the acid soil on the use of calcium magnesium phosphate, regardless of rice or dry grain have a better yield, but on the calcareous purple soil yield is not effective. According to the soil census survey in 1980, the content of available phosphorus was low. The content of available phosphorus (0.5M NaHCO 3 leaching) in paddy field was less than 10ppm, accounting for 80.7%. The content of available phosphorus was even less in early stage and 96.7% in less than 10ppm. Subsequently in the purple soil was applied to test the demonstration of calcium phosphate, the result is: Penglaizhen purple group, wheat Mushi 50-60 pounds of calcium phosphate, yield 25.1% more than the control, rice acres of calcium phosphate 40 Jinshan yield 16.1%; Artesian dark purple on (in