Prediction method of sunflower leaf area index growth based on the influence of salt and nitrogen

Abstract

The invention relates to a method for predicting the growth of sunflower leaf area index based on the influence of salt nitrogen. Relative leaf area index RLAI at each growth stage j ; Use the active accumulated temperature to normalize the growth stages of sunflower, and establish the RLAI j with DVS j The functional relationship; establish the average maximum single plant leaf area index LAI of sunflower in the whole growth period max Corresponding functional relationship with the level of salt and nitrogen; establish a prediction model of sunflower leaf area index affected by the level of salt and nitrogen; the sunflower that needs to be predicted will be based on the initial salt content of the soil before sowing, the level of nitrogen application and the location of the sunflower. The growth period of is calculated by the predictive model formula. The invention fully considers the influence of soil salt and nitrogen level on the growth of the sunflower leaf area index and the influence of various factors in the growth, and the calculation method of the established prediction model formula is simple, accurate and effective.

Description

technical field [0001] The invention relates to the technical field of plant growth, in particular to a method for predicting the growth of sunflower leaf area index based on the influence of salt and nitrogen. Background technique [0002] The photosynthesis and transpiration of plants are mainly carried out through leaves, so the study of leaf growth is particularly important. Leaf area index (LAI) is defined as the ratio of the total area of ​​plant leaves to the land area, and is an important index to quantitatively describe the growth status of plant populations, and to characterize the light energy utilization status of vegetation and canopy structure. LAI can provide structured quantitative information for the initial energy exchange description of the plant canopy surface, not only can directly reflect the energy, carbon dioxide and material environment in the plant canopy at various scales, but also can reflect the characteristics of plant growth and health. Condit...

AI Technical Summary

Problems solved by technology

Soil salinization has become an important limiting factor affecting the growth of crops in this area, seriously restricting the sustainable development of agriculture in this area

Improper application of chemical fertilizers will further affect the level of soil salinization

Especially the application of nitrogen fertilizer can promote the increase of crop yield in most cases, but excessive fertilization is harmful instead of beneficial

In areas affected by soil salinization, the presence of salt in the soil will change the transformation process of nitrogen, thereby affecting the absorption of nitrogen by crops and fertilizer efficiency; on the other hand, since nitrogen itself is also a kind of salt, excessive application Nitrogen, in turn, increases soil salinization, further reducing crop yields

Images