Effect of Amount and Method of Irrigation and Fertilization on Yield and Quality of Spinach
2023
YUAN Yi | LONG Ronghua | TAO Jing | WANG Qian | LI Shikai
【Objective】 Low water and fertilizer use efficiency and environmental pollution caused by excessive water and fertilizer supply are common in vegetable production. Taking spinach as an example, this paper studies the effect of irrigation and fertilization amount and method on its yield and quality. 【Method】 The experiment was conducted using a solar radiation irrigation controller to manage the irrigation and fertilization in that it started irrigation and fertigation when the accumulated solar radiation reached a pre-set threshold. We compared four treatments: low irrigation and fertilization (W1), moderate irrigation and fertilization (W2), sufficient irrigation and fertilization (W3), moderate irrigation without fertilization (W4). The control was conventional irrigation and fertilization used by local farmers (CK). 【Result】 The height and yield of the spinach in W5 were lower than that in W2 and W3. W5 led to the highest nitrate content in spinach and highest EC in soil after harvest. The height and yield of the spinach in W1 and W4 were the lowest. Nitrate content in the spinach, nitrate content and EC in the soil were the lowest in W4. W2 and W3 gave the highest plant height and yield. There was no significant difference in plant height and yield between W2 and W3, even though W3 used 1.4 times more water and fertilizer than W2. Nitrate content in spinach leaves in W3 was 1.4 times higher than that in W2. 【Conclusion】 For all treatments we compared, W2 was optimal for reducing water and nitrogen application without compromising spinach yield and quality.
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