Study On Increasing Yield Of Peanut By Water-permeability Plastic Membrane Mulching

The experiment was designed in a single factor random block. There were three treatments: water-permeability plastic membrane mulching, conventional plastic membrane mulching and un-mulching. The effect of water-permeability membrane on eco-physiology and yield of spring peanut was investigated by field experimentation and eco-physiology analysis. The results indicated as follow: 1.Water-permeability plastic membrane could improve limited rainfall penetration into soil through mini-holes of the plastic membrane, and also more effectively use small rainfall. At the meantime, it was able to keep soil moisture as conventional plastic membrane did. It could promote the accumulation of water in cultivated soil and provide reliable moisture for increasing peanut's yield. 2.Water-permeability plastic membrane can greatly decrease loss of the quantities of heat in soil. Through its mini-hole penetration, water-permeability plastic membrane mulching has abilities to maintain a suitable temperature in soil so that peanut could grow much better. It could also obviously accelerate peanut growth at early stage. 3.Water-permeability plastic membrane mulching could modify soil's physical and chemical nature, forming a more harmonious rhizospere micro-ecological environment. Compared to conventional plastic membrane mulching, water-permeability plastic membrane mulching can reduce soil volume-weight and raise soil void-fraction so that it can benefit microbe's activities and increase microbe's diversity and number, and promote decomposition of soil organic manure and conversion of effective nutrient. 4.In the same condition, the peanut under water-permeability plastic membrane flowered earlier, and the peanut could also get much more flowers and a relatively shorter flowering time so that the peanut could mature much earlier. Water-permeability plastic membrane mulching was able to increase the leaf area index of peanut and the ability of acquiring sunlight, which would benefit the nutrient uptake and speed peanut's growth. During whole growing period, the peanut under water-permeability plastic membrane usually has higher stems, longer lateral branches, more plump fruits per crop, a much higher population-dry-biomass -accumulation, and also a higher other biology indexes. Peanut's yield under water-permeability plastic membrane mulching increased by 9.8% compared to common plastic membrane mulching. The statistical analysis showed that variance of the yields between water-permeability plastic membrane mulching and conventional plastic membrane mulching reached a 0.05 significant level, the variance between water-permeability plastic membrane mulching and un-mulching reached a 0.01 significant level.