磷肥对棉花根生长的效应国外的研究表明，把棉花种植在两种不同土壤的钵中，一种是杜威粉质粘壤土，另一种是马尔文壤砂土，前者含磷较少，后者则含磷较多。按照恒定的基本比率加入磷肥，并逐渐减少比率：１．０、０．５、０．２５和０．１２５。结果表明，不仅棉花幼苗，... Effect of phosphate on cotton root growth Foreign studies have shown that cotton is planted in two different soil pots, one is Dewey silty clay loam, the other is Malvern loam sand, the former less phosphorus, after Who is more phosphorus. Add phosphate fertilizer at a constant base rate and gradually reduce the ratio: 1.0, 0.5, 0.25, and 0.125. The results show that not only cotton seedlings, ...