Comparative Study On Effects Of Wheat Photothermal Utilizationon Yield Under Wheat-Corn Cropping Sysytem In Central And North Of Henan

In order to further optimize the planting structure of wheat, reduce the waste of photothermal radiation between wheat and corn season, select the appropriate local cultivation of wheat which can use light and heat efficiently, this article studies the canopy structure, dry matter production and photothermal utilization of different wheat varieties in two areas of Henan and provide theoretical proposal to increase the yield of wheat and corn. This study was carried out in the central and northern of Henan province during 2013-2014, compared the physilological and ecological characteristics of spring and winter wheat.The main results are as follows:1. The time of growth stages of semi-spring wheat cultivar were earlier than other varieties, plant height of weak spring wheat cultivar was higher than that of other cultivars after flowering, but tiller amount of weak spring wheat cultivar showed no advantage after turning green stage. The plant height index in flowering of winter and spring wheat in the central and north of Henan were not significantly different, the length of the second joint under spike and the plant height of weak spring wheat in the north of Henan significantly larger than other wheat varieties. The length of first joint under spike of weak spring wheat cultivar was longer than other cultivars in the central of Henan. The angle indexes of winter and spring wheat between two areas were not significantly different.2. SPAD value of wheat leaves in the central of Henan is higher than that in north of Henan. The SPAD value of leaf between winter and spring wheat was significantly different, and SPAD value of winterness cultivars in each period lager than other cultivars. All wheat varieties in different ecological zones of flag leaf Gs and Pn were proportional after flowering, Gs and Ci were inversely proportional. Fv/Fm of all wheat varieties in two ecological zones from the jointing stage with the growth period showed a gradual downward trend, but the decline is small, remaining at around 0.8.3. Canopy interception PAR in Xuchang showed larger than that of the same wheat cultivar in Xinxiang. In flowering period, PAR showed significantly different between winter and spring varieties in both area, the PAR of winterness is largest and that of semi-spring wheat is smallest.4. Between the period of jointing and flowering, the dry matter accumulation aboveground grown fastest in two area. Contribution of dry matter translocated to grains, for north of Henan, showed weak winter>winterness>semi-winter>weak spring. For the central of Henan, showed weak spring>weak winter>winterness>semi-winter.5. In the central of Henan, weak winter wheat had the biggest solar-thermal utilization rate. In the north of Henan, solar-thermal utilization rate of weak winter and semi-winter wheat is biggest. The relationship between grain light energy utilization efficiency(x) and grain yield(y) could be showed by function y=47039.175+7967.24ln(x)(R2=0.995*)and the relationship between heat utilization efficiency of grain(x) and grain yield(y) could be showed by function y=2930.828e0.279x(R2=0.998*). In the central of Henan, the relationship between grain light energy utilization efficiency(x) and grain yield(y) could be showed by function y=47104.661+7995.944ln(x)(R2=0.997*), the relationship between heat utilization efficiency of grain(x) and grain yield(y) could be showed by function y=2930.835e0.291x(R2=0.997*). Production potential of wheat in the two regions have much room for improvement.