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In this study, in November 2003 June 2005 stud farm in Yunnan Province in Haifa white clover varieties for the study, a randomized block design, set up five water control treatment; combined indoor soil culture method, through dialogue clover seed fields and irrigation water demand time determination, water white clover seed yield and yield components of impact, water white clover vegetative and reproductive growth regulation, water white clover seed development and seed quality of other aspects studies of white clover seed production yield irrigation system, while from the perspective of in-depth study of physiological and biochemical water white clover growth regulation. The main results are as follows: white clover in the winter after irrigation, the soil water deficit is available from 0.42 to 0.48, crop stress index of 0.66 to 0.68 again when irrigation (w3) can get the highest seed yield. 2004 seed yield and harvest index available in the soil water deficit is around 0.20 (w2) is the highest, reaching 449.7 kg.hm -2 , harvest index of 8.7%, compared with the control output increased by 7 %: followed w3, seed yield and harvest index were 436.3 kg.hm -2 and 7.4%. 2005 w3 highest seed yield, reaching 434.9kg.hm -2 , harvest index was 6.63%, compared with the control production increased 20.67%. Through factor analysis on the yield obtained in 2004, the main production of seed yield impact factor is a single-seed weight and seed yield in 2005 affected the main production element is the number of inflorescences per unit area, number of pods per inflorescence and seed number per pod. Path analysis results showed that water production by altering the interaction between the elements affecting seed production. Water supply extended growth period of white clover, white clover accelerated growth rate; water deficit reduced the density of white clover stolons, increasing the number of fertile section, reducing the length of the section, leaf area, petiole and peduncle length; white clover biomass accumulation did not affect seed yield, water deficit affecting the distribution of dry matter of white clover on the ground rules, increasing the proportion of the reproductive organs. Photosynthetic rate on seed yield in 2004 was in pod, but in 2005 in the early flowering and pod. Soluble sugar content of each growth stage mainly concentrated in the stolons, budding and flowering root soluble sugar content of soluble sugar content in leaves affect seed yield. White clover stem and leaf soluble sugar content increases will reduce the photosynthetic rate. With the birth process moves forward, white clover inflorescence completely open shortened. Inflorescence open water deficit so concentrated, inflorescence stalk head and soluble sugar content affect pod inflorescence number per unit area. In addition, water has changed before and after flowering white clover leaf soluble protein, free amino acids, soluble sugars, gibberellins, abscisic acid, thus affecting the growth of white clover inflorescence. White clover seed water deficit so early maturity, an increase of white clover seed harvested hard real rate, reducing the seed grain weight. Germination and normal seedling rate of only w2 and available soil water deficit of around 0.60 (w4) there are significant differences between. White clover seed moisture treatments did not affect the vitality and white clover hard seed rate with the decrease of gibberellin content increases with abscisic acid content increases.
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