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首页> 美国卫生研究院文献>PLoS Clinical Trials >Influence of drainage and nutrient-solution nitrogen and potassium concentrations on the agronomic behavior of bell-pepper plants cultivated in a substrate
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Influence of drainage and nutrient-solution nitrogen and potassium concentrations on the agronomic behavior of bell-pepper plants cultivated in a substrate

机译：排水和养分溶液氮，钾浓度对基质栽培甜椒植株农艺行为的影响

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摘要

The interactive effects of N (6, 9, 12 and 15 mmol L-1) and K (3, 5, 7, and 9 mmol L-1) concentrations in nutrient solutions were evaluated on bell pepper grown in a coconut-coir substrate and fertilized without drainage. An additional treatment with drainage was evaluated using N and K concentrations of 12 and 7 mmol L-1, respectively. The hybrid Eppo cultivar of yellow bell pepper was cultivated for 252 days beginning 9 November 2012. Electrical conductivity (EC), the N and K concentrations in the substrate solution, marketable fruit yield, total dry weight and macronutrient concentrations in shoots were periodically evaluated. Fruit production was lower in the system without drainage, regardless of the N and K concentrations, compared to the recommended 10–20% drainage of the volume of nutrient solution applied. Higher K concentrations in the nutrient solution did not affect plant production in the system without drainage for the substrate with an initial K concentration of 331.3 mg L-1. Fruit yield was higher without drainage at a nutrient-solution N concentration of 10.7 mmol L-1. The upper EC limit of the substrate solution in the system without drainage was exceeded 181 days after planting. Either lower nutrient concentrations in the nutrient solution or a drainage system could thus control the EC in the substrate solution.
机译：N（6、9、12和15 mmol L -1 ）和K（3、5、7和9 mmol L -1 ）浓度的交互作用对在椰壳基质中生长的灯笼椒进行营养评估，并在不排水的情况下进行施肥。分别使用N和K浓度分别为12和7 mmol L -1 评估了排水的其他处理方法。从2012年11月9日开始，黄灯笼椒的杂交Eppo品种栽培252天。定期评估电导率（EC），底物溶液中的N和K浓度，可销售的水果产量，总干重和芽中的常量营养素浓度。无论氮和钾的浓度如何，不排水的系统中的水果产量均低于推荐的营养液体积的10–20％的排水量。营养液中较高的钾浓度不会影响系统中的植物产量，而对于初始钾浓度为331.3 mg L -1 的基质，不进行排水即可。营养液氮浓度为10.7 mmol L -1 时，不排水就可提高果实产量。种植后181天，没有排水的系统中底物溶液的EC上限超过了181天。营养液中较低的营养物浓度或排水系统都可以控制底物溶液中的EC。

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