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Effects of water-fertilizer coupling on greenhouse tomato growth and chlorophyll fluorescence parameters |
WANG Hubing, CAO Hongxia*, HAO Shuxue, PAN Xiaoyan |
College of Water Conservancy and Architectural Engineering, Northwest A&F University/Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, Yangling, Shaanxi 712100, China |
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Abstract In order to explore the effects of different amounts of irrigation and fertilizer on plant growth and chlorophyll fluorescence parameters of tomatoes, through solar greenhouse experiments, water volumes were set as 1.00E(W1), 0.75E(W2)and 0.50E(W3). Fertilizer treatments of N-P2O5-K2O(F)included 320-160-320 kg/hm2(F1), 240-120-240 kg/hm2(F2)and 160-80-160 kg/hm2(F3);besides, the local irrigation and fertilization was set as control(CK). The results showed that irrigation and fertilization had a significant effect on plant height except for 58 d. And the plant height increased with irrigation and fertilization increasing. The interaction of water and fertilizer only had a significant effect on plant height at 28 d and 38 d. The fertilization had a significant effect on stem diameter after 48 d, and the stem diameter increased with the amount of fertilizer rising at W1 level. Low fertilizer and low water are beneficial to the enhancement of the root-shoot ratio of tomatoes. Irrigation had a significant effect on Fv/Fm and ΦPSⅡ, and the fertilization also had a significant effect on Fv/Fm except for 56 d and ΦPSⅡ at 79 d and 86 d. The interaction of water and fertilizer only had a significant effect on Fv/Fm at 93 d. Fv/Fm increased with irrigation amount increasing, and it increased with the increasing of fertilizer at 79 d. While the ΦPSⅡ increased by increasing irrigation and fertilization after 79 d except for W3F2 treatment. Tomato plant height, stem diameter, Fv/Fm and ΦPSⅡ through the comprehensive analysis are all better when irrigation amount is 1.00E and fertilizer amount is 320-160-320 kg/hm2, which is beneficial to crop growth and yield.
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Received: 30 April 2018
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