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采用~32P示踪法研究了棉花、玉米两种作物吸收土壤磷和肥料磷的差异性.结果表明,玉米植株的吸磷总量大于棉花;棉花植株吸收肥料磷数量大于玉米;玉米植株体内来自土壤磷的比例大于棉底,而来自肥料磷的比例小于棉花;同一土壤条件下,种植玉米时,土壤的供磷能力(AP值)大于种植棉花时土壤的供磷能力.这些差异反映出棉花和玉米的吸磷能力不同,玉米的吸磷能力大于棉花的吸磷能力.同一种土壤能够供给玉米吸收的磷素数量大于供给棉花吸收的磷素数量.因此,对于土壤有效磷相对性的理解应该包括不同作物种类之间吸磷能力的差别;评价土壤有效磷数量时,针对不同吸磷能力的作物,应该用不同的指标来衡量.
The results showed that the total amount of phosphorus uptake in maize plants was greater than that in cotton plants. The cotton plants absorbed more phosphorus than maize plants. The maize plants came from The proportion of soil P was greater than that of cotton and the proportion of phosphorus from fertilizer was lower than that of cotton. Under the same soil conditions, the phosphorus supply ability (AP) of soil was higher than that of cotton when planting corn under the same soil conditions. Different from the phosphorus uptake ability of maize, the ability of phosphorus uptake by maize is greater than that of cotton, and the same kind of soil can supply more phosphorus to maize than the amount of phosphorus uptake by cotton.Therefore, the understanding of relativity of soil available phosphorus This should include differences in phosphorus uptake capacity among different crop species; when assessing the amount of available P in soils, different indicators should be used to assess different P uptake capacities.