Abstract:

It was so significant to chose an appropriate conservation tillage to increase the wheat yield, when learning the wheat yield discipline under different conservation tillage in north of China. The Diurnal variation of photosynthesis, yield and so on of ‘Qingmai 6’ was studied under five different conservation tillage in grain filling stage. It showed that, the Intercellular CO2 concentration of tillage without straw (CK) was higher than tillage with straw, while the SPAD, photosynthetic rate and stamata conductance were lower than the tillage with straw which had reached the significant difference. The kernel yield increased by 18.04% and 6.83% under subsoiling treatment, compared with CK and deep tillage treatments. The higher photosynthetic rate increased 1000-grain weight and grain number per spike of subsoiling tillage treatment, so that it got a much higher kernel yield. The phenomenon of photosynthesis lunch break was retarded by tillage with straw and it could preserve the photosynthetic rate of wheat at a high lever to increase the kernel yield. This study had shown that subsoiling tillage treatments was the most appropriate treatment, the result provided a theoretical basis for local conservation tillage research.