| In this paper, the effects of the cooperation of Phosphorous and water on the maize's growth, the physiological characteristic, the water's consumption, dry matter's accumulation and distribution, water use efficiency and nutrition intake etc.were studied. In additions, the photosynthesis, the chlorophyll fluorescence induction kinetics, the grain filling process and the yield of winter wheat were studied under different levels of supplying water and phosphorous in the fluo-aquic soil area where available Phosphorous was deficient during grain-filling stage. The results showed that:1.under sand culture condition, applying Phosphorous reduced the plants water consumption and its' water use efficiency under limited water supply; but under the moist condition and the alternation of aridity and wet condition, applying Phosphorous increased plants to grow and enhanced its' water use efficiency.2.In the pot trial, both water and phosphorous could increase the height of plant, the area of leaves and the total biomass. And the phosphorous effect was more remarkable; The limited water combined applying phosphorous was favorable to raise R/S ,during seedling stage. The pot trial and the sand culture trial had not reached the consistent conclusion. The former indicated that the Phosphorous was more important than water for maizes' growth, but the latter indicated that under limited water supply, Phosphorous reduced the height of plant and the area of leaves though it increased the number of leaves.3.Both water and phosphorous could increase to transport the nitrogen > phosphorous ^ potassium nutrient to plant's above-ground parts.4.Sand culture trial and rain-proof mini-plot rial both proved phosphorous had remarkable effect on improving plant's photosynthesis efficiency,5. In the fluvo-aquic soil area where available phosphorous was deficient, under the condition of no irrigation during the whole life of winter wheat, the opening and closing of stoma were stressed because of water-deficiency during the grain-filling stage, the photosynthetic rate of winter wheat declined, while water use efficiency rose. Irrigation improved the photosynthetic rate and the apparent photosynthesis quantum efficiency. Under the same water-supply level, light response of photosynthesis and the apparent photosynthesis quantum efficiency grew with the improvement of P's amount. Winter wheat irrigated possessed higher values of |
PDF Full Text Request