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大量研究工作都试图搞清楚植物营养与环境因子(光、有效水,温度)以及植物生长各阶段与营养吸收之间的关系。 1.根系 缺钾会限制根系的生长,它既可导致须根数量的减少,还可限制原生根和不定根的长度。 根尖一向被认为是钾素吸收最活跃的部位,但是,钾的吸收不是完全被局限于根系的这一特定部位,它和整个根系的体积有关。(不光是根系长度和表面积)。因此当土壤中含钾量下降导致单位根系表面或单位体积吸收速度也随之下降时,根系的发育是特别重要的。它的整个体积是主要的决定因素。 2.叶片 不同营养元素对叶片生长的详细作用机制还不是很明确,但是可以肯定,他们都影响整个叶面积。就增加叶面积而言,氮素是最重要的,氮素供应充足时,磷、钾对叶面积的增长也有一定作用,磷钾不仅影响叶面积还影响到叶片寿命。
Numerous research efforts have attempted to clarify the relationship between plant nutrition and environmental factors (light, effective water, temperature) and various stages of plant growth and nutrient uptake. 1. Root potassium deficiency can limit the growth of the root system, it can lead to a decrease in the number of fibrous roots, but also to limit the length of primary roots and adventitious roots. Root tips have always been considered as the most active sites for potassium absorption. However, the absorption of potassium is not completely confined to this specific part of the root system, and it is related to the volume of the entire root system. (Not just root length and surface area). Therefore, the development of the root system is particularly important when the amount of potassium in the soil is reduced resulting in a corresponding decrease in the rate of absorption per unit volume of the root surface. Its overall size is a major determinant. 2. The detailed mechanism of action of different nutrients on leaf growth is not yet clear, but it is certain that they affect the entire leaf area. In terms of increasing leaf area, nitrogen is the most important. When nitrogen supply is sufficient, phosphorus and potassium also play a certain role in the growth of leaf area. Phosphorus and potassium not only affect leaf area but also affect leaf life.