Greenhouse horticultural crops are characterized by high levels of efficiency and productivity of irrigation water and nutrients applied. However, these indices may be affected by poor distribution uniformity of fertigation (DU). Different previous prospective studies show that there is a significant percentage of facilities with a low level of DU. However, there is no precise relationship between DU and the efficiency and productivity of water and fertilizers. This relationship may be affected by different factors, especially by the irrigation dose. The objective of this work was to determine the effect of the distribution uniformity of fertigation and the fertigation volume (FV) on the bio productive parameters and efficiency of water and nutrient use of the zucchini crop. The trial was developed in a greenhouse located in La Mojonera (Almeria), on sanded soil. The greenhouse was equipped with an automated fertigation installation. The experimental design was randomized complete blocks with six treatments and three repetitions. The established treatment was a combination of two factors: distribution uniformity and fertigation volume. Three levels of DU were established: 100%, 75% and 50% approximately and two levels of fertigation volume: FV100% and FV70%. Volume of water and nutrients applied, soil matric potential (SMP), yield, biomass and efficiency in the water and nutrients use were determined. The maximum efficiency in the use of water and nutrients was obtained with a DU of 100% or 75% and a fertigation volume of FV70%, but this fertigation volume reduced the bio-productive parameters of the crop such as yield. The maximum yield and biomass were obtained with the volume of fertigation of 100% (FV100%), and with a DU of 100% or 75%. DU50% level reduced all bio-productive parameters, reducing yield by 45%, as well as the water use efficiency (WUE) and nutrient efficiency with any level of fertigation.

中文翻译：

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分布均匀度和施肥量对温室西葫芦作物生物生产力的影响

温室园艺作物的特点是灌溉用水和养分的效率和生产力水平很高。然而，这些指标可能会受到灌溉施肥 (DU) 分布均匀性差的影响。不同的先前前瞻性研究表明，有很大比例的设施具有低水平的 DU。然而，DU与水肥效率和生产力之间没有确切的关系。这种关系可能受到不同因素的影响，尤其是灌溉剂量。这项工作的目的是确定施肥分布均匀性和施肥量 (FV) 对西葫芦作物的生物生产参数和水分和养分利用效率的影响。该试验是在位于拉莫约内拉（阿尔梅里亚）的温室中开发的，在砂土上。温室配备了自动施肥装置。实验设计是随机的完整区组，有六个处理和三个重复。既定的处理是两个因素的组合：分布均匀性和灌溉施肥量。建立了三个 DU 水平：大约 100%、75% 和 50%，以及两个水平的施肥量：FV100% 和 FV70%。确定施用的水和养分的体积、土壤基质势（SMP）、产量、生物量和水和养分使用的效率。使用 100% 或 75% 的 DU 和 FV70% 的灌溉施肥量可获得最大的水和养分利用效率，但这种灌溉施肥量降低了作物的生物生产参数，如产量。最大产量和生物量是在施肥量为 100% (FV100%) 和 DU 为 100% 或 75% 时获得的。DU50% 水平降低了所有生物生产参数，降低了 45% 的产量，以及任何施肥水平的水分利用效率 (WUE) 和养分效率。