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采集四川省6种主要紫色母质上发育的土样16个,进行盆栽试验和分析测试,结果表明,紫色土中Fe—P(x_1)、Ca—P(x_2)、O—P(x_3)和有机—P(x_4)与无磷处理水稻吸磷量的多元回归式为y=-158.6+6.3580x_1+0.4488x_2+0.1515x_3+ 0.8762x_4与小麦幼苗吸磷的回归式为y=1.1275+0.01627x_1-0.000504x_2+0.00144x_3+0.000517x_4,Fe—P是作物良好的磷源。石灰性紫色土磷位值说明它们受Ca—P控制。有效磷测定方法筛选结果,Bray-Ⅰ法,在中、酸性土中能按比例提取Fe—P,在石灰性土中则与Ca—P相关性很高;Mehlich法在中、酸性土中主要能提取Ca—P,,但与植物吸磷不符;Olsen法则皆可。
A total of 16 soil samples were collected from six primary purple parent materials in Sichuan Province. Pot experiments and analysis were conducted. The results showed that Fe-P (x_1), Ca-P (x_2), O-P The multiple regression equation of phosphorus uptake by organic-P (x_4) and non-phosphorus-treated rice was y = -158.6 + 6.3580x_1 + 0.4488x_2 + 0.1515x_3 + 0.8762x_4.The regression equation of phosphorus uptake by wheat was y = 1.1275 + 0.01627x_1- 0.000504x_2 + 0.00144x_3 + 0.000517x_4, Fe-P is a good phosphorus source for crops. Calcareous purple soil phosphorus values indicate that they are controlled by Ca-P. Bray-Ⅰ method can extract Fe-P proportionally in acid soil and Ca-P in calcareous soil. Mehlich method is mainly used in medium and acidic soil Ca-P can be extracted, but does not accord with plant phosphorus absorption; Olsen’s law can be.