Effects of Different Tillage Practices on Photosynthetic Characteristics of Crops in the Loess Plateau

Abstract

This thesis bases on traditional farming and no-till covering different measures as the research object, analyzes on crop photosynthetic physiological indexes, the results are as follows: With the period of growth, leaf net photosynthetic rate of each process has a rising trend from high to low. Tasseling stage has the most obvious the phenomenon. Under the traditional tillage condition, plastic film mulching with the straw mulching has the highest net photosynthetic rate. The straw mulching is the lowest. Under no-till conditions, the highest net photosynthetic rate of plastic film mulching on average is 33.81 (including mol/(m2, s). It is 3.7% higher than no cover. Under different tillage coverage measures condition, the leaf transpiration rate shows that tasseling stage is higher than jointing stage of ratooning buds. Jointing stage of ratooning buds is higher than huge bellbottom period. Huge bellbottom period is higher than seedling. Seedling is higher than mature period. In seedling stage, spring maize stomatal conductance is lower. Tasseling stage to achieve the highest. Under traditional tillage condition, the mulch with straw mulching maintains a higher average stomatal conductance 260.63 parts per million. It is 46.0% higher on average than uncovered; under no-till conditions, plastic film mulching has the highest transpiration rate of, and straw mulching is the lowest.