Studying the effects of water and fertilizer coupling on the activities of antioxidant enzymes(SOD,POD,CAT),the content of malondialdehyde(MDA),proline(Pro),soluble sugar(SS),protein(SP),and water use efficiency(WUE)of tomato leaves in the vermiculite-based composite substrate,can provide a theoretical basis for the cultivation of protected tomato on vermiculite-based composite substrate.This study employed Double Win Pioneer tomatoes as the experimental material.The experimental design included four factors:irrigation,nitrogen,phosphorus,and potassium.A half-fractional execution of a four-factor,five-level orthogonal rotated combination design was used.The results showed that the activities of SOD,CAT,and the contents of Pro,SS in tomato leaves increased first and then decreased,while the activities of POD and the contents of MDA,SP increased.Too high or too low an amount of irrigation and fertilization will lead to a rapid increase in MDA content and a decrease of enzyme activity.Under proper irrigation,the content of POD,CAT,and SS was higher with medium-level fertilizer,and the content of SP was higher with high nitrogen fertilizer.Under medium levels of water and fertilizer,water use efficiency increased by 53%,and fertilizer partial productivity increased by 42%.In this experiment,W18 was the best treatment,78.0%irrigation level,340 kg/hm2 of nitrogen,185 kg/hm2 of phosphorus,310 kg/hm2 of potassium.The maximum yield was 147.69 t/hm2,and the highest water use efficiency was 22.74 kg/m3,the highest partial fertilizer productivity was 176.24 kg/kg.This study can provide a theoretical basis for scientific management of water and fertilizer for the full use of vermiculite production and high-efficiency and high-quality tomato cultivation in Xinjiang.
Tomatowater-fertilizer couplingleafenzyme activityIrrigation water use efficiencypartial fertilizer productivity
NETL
NSTL
维普
万方数据
