| A field experiment was carried out on cultivated loessial soil in semiarid areas. The corn(Zea mays L) Shaandan 902 used as a indicating crop to study the effect of plastic muchling, straw mulching and traditional culture on the physiological charicteristucs. The results showed that plastic film mulching significatly increaseed the photosynthesis rate, the content of chlorophyll and water capacity of leaf, but the transpiration rate decreased. Du to the reasons listed above, the accumulation of dry matter was greater in plastic film mulching, and after harversting,the yield was also greater than others. |