The Effect of Irrigation and Fertilization on Growth and Quality of Tomato under Fertigation in Greenhouse

A greenhouse fertigation experiment was conducted to study the effects of different irrigation and fertilization on growth and quality of tomato, which can provide a theoretical basis for the high yield and good quality water and fertilizer coupling model in this field. In the experiment, the tomato cultivar' HuiYu 0806' was chosen as experiment material, and designed with two factors and three levels, three irrigation amounts 〔I1 (100%ET0), I2(75%ET0), I3(50%ET0)〕, three NPK fertilizer application rates 〔F1(N480 kg·hm-2, P2O5 240 kg·hm-2, K2O 300 kg·hm-2), F2(N360 kg·hm-2, P2O5 180 kg·hm-2, K2O 225 kg·hm-2), F3(N 240 kg·hm-2,P2O5 120 kg·hm-2, K2O 150 kg·hm-2)〕, and three replicates. The result showed that there had a positively correlated between the tomato plant height, stem diameter and the levels of irrigation and fertilizer in terms of growth and water use, the combinations of fertilization and irrigation treatment (I2F2) had high yield (102 042.3 kg·hm-2), dry matter accumulation (37.19×103 kg·hm-2) and irrigation water use efficiency(IWUE) (37.3 kg·m-3). There was a significant coupling effects of irrigation ration and fertilizer on the tomato quality. the I2F2 treatment had a high content of Vc content (27.05 mg·100g-1) and lycopene content (71.53 μg·g-1) and a low sugar-acid ratio (9.57), the soluble solids content(7.3%) in tomato fruits compared with other treatments. Based on the synthesis analysis, the I2F2 treatment has high yield and good quality compared with other irrigation and fertilization treatments.