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首页> 外文期刊>HortScience >Effects of Low pH of Hydroponic Nutrient Solution on Plant Growth, Nutrient Uptake, and Root Rot Disease Incidence of Basil (Ocimum basilicum L.)
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Effects of Low pH of Hydroponic Nutrient Solution on Plant Growth, Nutrient Uptake, and Root Rot Disease Incidence of Basil (Ocimum basilicum L.)

机译：水培营养液低pH对粮农植物植物生长，营养吸收和根腐病发病率的影响（OCIMUM Basilicum L.）

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摘要

Rootzone pH affects nutrient availability for plants. Hydroponic leafy greens are grown in nutrient solutions with pH 5.5 to 6.5. Lower pH may inhibit plant growth, whereas pathogenic oomycete growth and reproduction may be mitigated. General understanding of pH effects on nutrient availability suggests likely toxicity and deficiency of specific micronutrients. We hypothesized that if adjustments are made to the micronutrient concentrations in solution, plants will grow in lower-than-conventional pH without nutrient disorders, while oomycete disease incidence and severity may be reduced. To develop a new nutrient solution management strategy, we examined pH of 4.0, 4.5, 5.0, and 5.5 with or without micronutrient adjustments for growing two cultivars of basil plants Dolce Fresco and Nufar in a greenhouse hydroponic deep-water culture (DWC) system. Micronutrient adjustments included reduced concentrations of copper, zinc, manganese, and boron by one-half and doubled molybdenum concentration. Plants harvested 20 to 28 days after transplanting did not show significant effects of pH or the micronutrient adjustment. Phosphorus, calcium, magnesium, sulfur, boron, manganese, and zinc concentrations in leaves significantly declined, while potassium and aluminum concentrations increased with decreasing pH. However, these changes and therefore micronutrient adjustments did not affect basil plant growth significantly. 'Nufar' basil plants were then grown in a growth chamber DWC system at pH 4.0 or a conventional 5.5 with and without inoculation of Pythium aphanidermatum zoospores. Fourteen days after inoculation, P. aphanidermatum oospore production was confirmed only for the inoculated plants in pH 5.5 solution, where a significant reduction of plant growth was observed. The results of the present study indicate that maintaining nutrient solution pH at 4.0 can effectively suppress the severity of root rot caused by P. aphanidermatum initiated by zoospore inoculation without influencing basil growth.
机译：rootzone pH对植物产生营养可用性。水培叶片绿叶以pH5.5至6.5的营养溶液生长。较低的pH可以抑制植物生长，而可以减轻致病的oomycete生长和繁殖。对pH对营养可用性的一般性理解表明特异性微量营养素的毒性和缺乏。我们假设如果对溶液中的微量营养素浓度进行调整，则植物将在低于常规的pH下生长而没有营养障碍，而臭核查发病率和严重程度可能会降低。为了开发一种新的营养解决方案管理策略，我们将在4.0,4.5,5.0和5.5的pH中，在温室水耕的深水培养（DWC）系统中生长两种罗西植物Dolce Fresco和Nufar的微量营养调整。微量营养素调节包括将铜，锌，锰和硼的浓度降低一半和加倍钼浓度。移植后20至28天收获的植物没有显示pH或微量营养素调节的显着影响。含磷，钙，镁，硫，硼，锰和锌浓度显着下降，而钾和铝浓度随着pH的降低而增加。然而，这些变化并因此微量营养素调整不会显着影响罗勒植物生长。然后在pH 4.0或常规5.5的生长室DWC系统中生长'Nufar'罗勒植物，其中常规5.5，并且没有接种褥疮Aphanidermatum子孢子。接种后14天，P.P.Phanidermatum oospore生产被证实仅针对pH5.5溶液中的接种植物确认，其中观察到植物生长的显着降低。本研究的结果表明，在4.0时保持营养溶液pH可以有效地抑制由Zoospore接种的P. aphanidermatum引起的根腐的严重程度而不会影响罗勒生长。

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