Inter鄄cropping and mixed鄄cropping can increase the yield and stress resistance of maize. The inter鄄 and mixed鄄 cropping of different maize cultivars with different mature plant heights can improve aeration and transmittance conditions and increase the leaf area index, marginal effect, and rate of photosynthesis, all of which can increase grain yield. The inter鄄 and mixed鄄cropping of different maize cultivars with different levels of resistance to disease, pests, lodging, and drought can also increase yield size and stability. The yield of maize can also be increased by inter鄄 and mixed鄄cropping of different maize genotypes. In all these cases, suitable stripe arrangements are vital to success-here defined as creating a larger, more stable yield. However, previous studies on inter鄄 and mixed鄄cropping have mainly focused on 1 颐 1 stripe arrangements. There is currently a dearth of research into optimal stripe arrangements for inter鄄 and mixed鄄cropping of maize. For these reasons, the present study was designed to investigate the effects of stripe arrangement on inter鄄 and mixed鄄cropping outcomes with respect to maize yield, resistance to disease and lodging, photosynthesis capability and microclimate, and establish optimum stripe arrangement for inter鄄 and mixed鄄cropping of different maize genotypes.
Light is one of the most important environmental factor influecing the growth and development of maize (Zea mays L.). Sufficient light during the growing period is the basis of high yield formation of maize. However, there are always prolonged rainy days during maize growing season in the Huang鄄huai鄄hai region, which are detrimental for maize yield formation. And prolonged rainy days at flowering stage bring more severe damage to maize production. Low鄄light environment leads to a decrease in photosynthetic rate, a reduction and redistribution of biomass, an extension of anthesis to silking interval, and a significant reduction of ear kernel number and grain yield. And there are significant differences in maize genotypes responses to low light stress. Previous studies have elucidated the effects of endogenous hormones on the apical kernels abortion and under low鄄light stress. However, whether the endogenous hormones have influence on the whole ear development process is unknown. A split plot experiment was conducted under field conditions during 2010 and 2011, to study the effects of shading and light recovery on the growth and development of maize ear and endogenous hormones of two maize hybrids. The main plots are light treatment (natural light and 50% shading) and sub鄄plots are cultivars (low light sensitive hybrid YY22 and low light tolerance hybrid ZD958). In the low light treatment, maize plants were shaded with 50% transmittance shading nets from 3 days before tasselling to 10 days after silking. The results showed that the growth and development of maize ear was delayed, ear length, ear diameter, ear dry weight, ear row number, kernel number and kernel sink capacity were significantly decreased while barren tip increased under low light conditions with low
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