Study On Effects Of Irrigation, Nitrogen Supply On Tomato Growth, Development And Quality In Solar-Greenhouse

In this experiment, the effects of 6 irrigation and nitrogen levels (W1N1, W1N2, W1N3, W2N1, W2N2, W2N3) and 7 varieties on growth, development and quality were studied through autumn to winter cultural tomato (Lycopersicon esculentum Miller) in solar greenhouse, in addition, different and varieties were evaluated muti-objectively and comprehensively by Grey Relativity Analysis. The main results are as follows:1) In this experiment, tomato growth not affected under different water and nitrogen levels, yields is not distinctly affected by irrigation supply, but nitrogen supplies. The yields increased prominently alongwith nitrogen increasing.2) Chlorophyll content, nitrate content, nitrate reductase activity and catalase activity in stem or leaf significantly increased and reduced along with nitrogen and water levels raising.3) The shortness and excessiveness of nitrogen supply would reduce ascorbic acid (Vc) content, but not affected by water supply. Soluble protein, free amino acid, organic acid and nitrate content in tomato fruit are effectively improved according to the nitrogen increment along nitrate increment in tomato fruit, but not affected by water supply. Content of nitrate increased along with nitrogen supply levelsraising, but decreased significantly with its ripening.4) Among the six treatments, W2N1 had the best based on the results of Gray Relativity Analysis considering yield and quality.5) Significant negative correlation at level 0.05 between tomato leaf nitrate reductase activity and nitrate were found, had distinct difference , and significant positive correlation at level 0.01. Nitrite reductase activity had no distinct difference, nitrite content had distinct difference, significant positive correlation at level 0.05 between nitrite and nitrate.6) The content of water had no distinct difference in tomato fruit. The effects of varieties on Vc, soluble protein and sugar, organic acid were the greater. But the content of nitrate had distinct difference and nitrite content no distinct difference. Significant positive correlation at 0.05 between fruit soluble protein and free amino acid had distinct difference, significant positive correlation at 0.01 between fruit nitrate and nitrite had distinct difference.