论文部分内容阅读
预测土壤的需磷性,是因土施用磷肥的关键。各种土壤的需磷性不同,取决于各自供磷能力和固磷作用的强弱。供磷能力弱的土壤的需磷性大,反之则小.土壤对磷的固定作用,使施入土壤的大部分磷肥转化为作物不易吸收的形态,因而固磷作用强的土壤的需磷性也大。目前,一般根据土壤有效磷的化学测定,定性地估计土壤的需磷性。然而土壤的有效磷水平只能相对地反映土壤的供磷能力,并不反映土壤的固磷作用。这样,仅根据土壤有效磷含量,尚难定量预测土壤的需磷性。本文应用示踪技术,初步探索土壤需磷性的预测问题。
Phosphorus prediction of soil is due to soil phosphate fertilizer key. Phosphorus needs a variety of different soil, depending on their ability to supply phosphorus and the strength of phosphorus fixation. Phosphorus deficiency is weak in the soil needs phosphorus, and vice versa.Pending of the role of phosphorus in the soil, so that most of the phosphate applied to the soil into the form of crops is not easy to absorb, and therefore strong phosphate-fixing soil needs phosphorus Also big. At present, the phosphorus demand of soil is qualitatively estimated based on the chemical determination of soil available phosphorus. However, the effective phosphorus level of soil can only reflect the phosphorus supply capacity of the soil relatively, and does not reflect the phosphorus fixation effect of the soil. In this way, it is difficult to quantitatively predict the phosphorus demand of the soil based only on the available phosphorus content of the soil. In this paper, the application of tracer technology, preliminary exploration of soil phosphorus demand prediction.