番茄滴灌水氮耦合效应与模式研究

为探明番茄高产优质高效生产的灌溉施肥制度和最优水氮耦合模式,开展了不同滴灌水氮耦合方式对番茄产量、品质和水氮利用的影响的田间试验.结果 表明:与F0W0(土施100％N肥基肥,降雨+补充滴灌灌水)相比,F2W2(交替滴灌方式施用100％N肥和80％常规灌水量)、F3W2(土施40％ N肥-基肥-交替滴灌方式追施60％N...

Water and Nitrogen Coupling Effects and Model Under Tomato Drip Irrigation

To explore the irrigation and fertilization system and the optimal coupling mode of water and nitrogen (N) for high-yield, high-quality and high-efficiency of tomato production under drip irrigation, a field experiment was conducted to investigate the effects of different water and N coupling modes on tomato yield, quality, and water and N use under drip irrigation. The results showed that compared with F₀W₀ (100% N fertilizer applied to soil as basal fertilizer and rainfall + supplementary drip irrigation), F₂W₂ (100% N fertilizer via alternate drip irrigation and 80% conventional irrigation amount), F₃W₂ (40% N fertilizer applied to soil as basal fertilizer, 60% N fertilizer via alternate drip irrigation as topdressing and 80% conventional irrigation amount), F₄W₂ (100% N fertilizer via fixed drip irrigation and 80% conventional irrigation amount) and F₅W₂ (40% N fertilizer applied to soil as basal fertilizer, 60% N fertilizer via fixed drip irrigation as topdressing and 80% conventional irrigation amount) increased tomato yield, water use efficiency and partial productivity of N fertilizer. F₂W₂ enhanced vitamin C, soluble sugar and sugar/acid ratio of tomato by 42.5%, 25.5% and 131.9%, respectively. F₂W₂ had the optimal comprehensive quality of tomato evaluated by principal component analysis, and the optimal comprehensive benefit of tomato yield, quality, and water and N use evaluated by TOPSIS. Therefore, 100% N fertilizer via alternate drip irrigation and 80% conventional irrigation amount (F₂W₂) is the optimal coupling mode of water and N for tomato under drip irrigation.