| A field experiment was conducted to determine the effect of different density on the microclimate and yield components of cotton plants.The study results indicate that different density of cotton plants can affect the structure and lead to great changes;therefore the field's light, temperature and other climatic factors will change.The light transmittance has a reducing tendency with the density increasing at different levels.After peak flowering period the smallest transmittance is only about 10%.For soil moisture, too small density leads to serious surface dissipation while oversized density causes excessive leaf transpiration and great water consumption. Therefore the density of 180 000plant·hm-2 can use the moisture content fully.In different humidity level, small density causes leaf transpiration which makes moisture dissipation, while oversized density leads to slow dissipation but quick transpiration.Therefore, the medium density of 180 000 plant·hm-2 and 225 000 plant·hm-2 has better results, and there is little temperature difference in each treatment.For yield, along with the density increasing, the yield increases first and then decreases, and the treatment of 180 000 plant·hm-2 has the highest yield, averaging 3 247.4 kg·hm-2. |