Abstract
In order to study the application of light and simplified cultivation mode in straw returning field. In the experiment, two treatments of straw returning and non-straw returning were used under the light simplified cultivation mode, and the differences of tiller number, dry matter accumulation, leaf area index, chlorophyll and yield were studied. Field cultivation experiments were carried out with Jihong 9 and Jinongda 138. The results showed that the yields of Jihong 9 and Jinongda138 straw returning to the field under the light and simplified cultivation mode were 2.00% and 3.63% higher than those under the non-straw returning mode. The total grain number in the yield components increased by 3.35% and 11.60% respectively. Dry matter increased by 19.70% and 7.66% in mature period. The leaf area index (LAI) and SPAD value in the later period of straw returning were higher than those in the non-straw returning, and the number of effective tillers was lower. Light and simplified cultivation can be used as a new mode of rice high-yield cultivation under straw returning, which improves the total grain number, leaf area index, SPAD value and dry matter in the later stage, and increases rice yield. The yield advantage of Jinongda 138 under straw returning (SJ138) is more significant.
Highlights
With the continuous improvement of China's agricultural comprehensive production level, China's agricultural production of straw continues to increase
Compared with Jihong 9 (J9), the yield of sj9 increased by 2.00%, and the yield of sj138 increased by 3.63% compared with that of JNongda 138 (J138)
The main reason was that the total number of cases of sj9 and sj138 increased by 3.35% and 11.60% compared with J9 and J138; compared with sj9, the seed-setting rate of sj138 decreased by 10.91%, but the total number of grains increased significantly by 27.06%
Summary
With the continuous improvement of China's agricultural comprehensive production level, China's agricultural production of straw continues to increase. Crop straw is a kind of carbon rich energy material, which can improve the nitrogen use efficiency of crops, loosen the soil, improve the permeability, so as to improve the nutrient absorption capacity of crops[2,3]. Straw returning is of great significance to the sustainable development of agriculture and the improvement of environment[4]. In the early stage of rice straw returning, rice growth was inhibited, but it had a positive impact on rice dry matter accumulation and other growth indicators in the middle and late stage of rice[5].
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