The Dynamics Of Some Physiological Characteristics Of Wheat, Cucumber And Spinach Under Water Precision Controlled

Different from traditional water potted plant experiment, the experiment is carried out by using self-designed devices for control of water supply tension Physiological characteristics of wheat seeding, cucumber and spinach were measured. The relationship of soil water content and plant growth was researched. The main result is following:1. The performance and apply manner of instrument were confirmed. We have offered a new way to control soil water content for plant potted water experiment. It has some spread meaning. It's adjustive range is 0hpa to 800hpa. It can meet our experiment require.2.The research suggested: Pn, and Tr rise at the beginning along with the accretion of water supply tension, and then come down when the water supply tension is between lhpa and 190hpa; While the overground dry weight and the leaf area are dropped slowly; the root weight is rising at the beginning and then dropping slowly; the unifoliate water using efficiency is on the downtrend when the water supply tension arises; The colony water using efficiency is rising along with the water supply tension's accretion when it is under 100hpa, and the colony water using efficiency changed little when the water supply tension exceeds 100hpa. The rising water is significantly corresponded with the fresh weight, dry weight and R/S. the correlation equations are Y=3.6899Ln(x)+7.5158(R~2=0.6461),Y=0.508Ln(x)+1.3593(R~2=0.6066), Y=-0.3863Ln(x)+0.7864 (R~2=0.6686).3. The results showed that parenting process of cucumber slowed down progressively, the number of staminate or pistillate flowers decreased and the accumulation of organs reduced too with water supply tension rising. Plant WUE and yield WUE were positively corresponded with water supply tension when water supply tension was among lhpa and 20hpa. When water supply tension was among 20hpa and 80pa, plant WUE was negatively corresponded with water supply tension and yield WUE basically keep unchanged. When water supply tension exceeded 80hpa, plant WUE and yield WUE were all negatively corresponded with water supply tension. R/S was positively corresponded with water supply tension when it was below 20hpa; R/S hold the line when water supply tension exceeded 20hpa. The rising water was significantly corresponded with cucumber fresh weight, cucumber dry weight, root dry weight, leaf dry weight, stem dry weight, outground, and total dry weight. The correlation equations were Y=0.6564Ln(x)-5.8541, Y=20.499Ln(x) -181.03, Y= 10.476Ln(x)-92.606,Y= 17.188Ln(x)-151.11, Y=6.0303Ln(x)-52.668, Y=65.531 Ln(x)-5 81.14,Y=55.054Ln(x)-488.84. The correlation coefficients were all above 0.9.4. When water supply tension was less than 30hpa, outground biological accumulation rise at the beginning along with the accretion of it. When water supply tension exceeded 30hpa, outgrount biological accumulation came down with the accretion of it. Primary established the relationship between rising water and spinach fresh weight, dry weight. The correlation equations were y = 0.8712x-0.9085 (R~2=0.9628) and y = 1.6484x-1.0459 (R~2=0.9177). In short supply of water, leaf carboxylation efficiency and apparent quantum yield were cut down.