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Alfalfa as the most important quality green feed, is the material basis of the development of herbivorous animal husbandry, and play an important role in livestock production. Study of water and fertilizer impact on the the Jingnan region alfalfa production performance and quality, provide a scientific basis for the practice of the Jingnan alfalfa production, this important area dairy development. 3 years of planting alfalfa irrigation amount (0, 25, 50 and 75mm / irrigation three times throughout the year) × P application rate (0,155,310 kg/hm2) two-factor randomized trial, a total of 12 treatments. Each crop of alfalfa early flowering of each treatment was measured yield the 2,3 crop alfalfa leaf ratio, plant height and crude protein content, neutral detergent fiber content of the second single branch, and determination of the 3 crop alfalfa branches of different irrigation treatments photosynthetic characteristics. The results show that: 1 The case study the fertilizer gradient range, one year before the test filling enough winter water, water for the first crop of alfalfa yield and plant height had no effect, 2, 3 crop years alfalfa production strains high increase in 4th cutting alfalfa yield and plant height, irrigation amount increased with increased irrigation. Moisture on the 1st, 4th cutting alfalfa leaf ratio had no significant effect, weight 2,3 stubble alfalfa leaf ratio and branching are increased with the irrigation amount increased. Fertilizer treatments on crop alfalfa yield 1 to 4, plant height, leaf ratio and annual production had no significant impact. 2. Different irrigation treatments on stomatal conductance branching stage of alfalfa leaves the greatest impact, the coefficient of variation of 17.88%. Alfalfa photosynthetic rate, transpiration rate, intercellular CO2 concentration and stomatal conductance with irrigation volume increases. 3. Increased irrigation of alfalfa neutral detergent fiber content, resulting in lower crude protein content; alfalfa neutral detergent fiber content increases with the irrigation amount, the crude protein content was the opposite trend. Increase of P conducive alfalfa neutral detergent fiber content lower and crude protein content increases with the applied phosphorus increased alfalfa neutral detergent fiber content was lower and crude protein content was increased change, so that the alfalfa quality is improved. Jingnan planting alfalfa should first cut of the second crop of alfalfa mow irrigation, the 4 crop the alfalfa growth period should not irrigation, alfalfa turning green when enough winter water irrigation in the previous one year before winter, from time irrigation. In total growing season precipitation 391mm circumstances, the most appropriate throughout the year irrigation amount for 150mm. The gradient of this study, to improve year alfalfa production angle, from time to fertilize; due to the decrease of soil available phosphorus fertilization can reduce and conducive to improve the quality of alfalfa, it is still recommended fertilization speaking, from the quality point of view to improve soil fertility and alfalfa.
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