Different approaches have been used to improve mineral nutrient status of plants in absence of chemical fertilization and toward safer products and improved human health. Amino acids have been proposed with such roles in different recent studies. In this study, glycine was applied as foliar (250, 500 and 1000 ppm) or as soil (250 and 500 mg/plant) to cucumber plants compared to unfertilized control and NPK fertilization, under greenhouse conditions. The results showed that all glycine treatments increased leaf area and the economic life of plants compared to control. Soil application of glycine at higher concentration of 500 mg/plant was able to produce the same or better records than NPK fertilization, particularly regarding leaf mineral concentration, plant economic life and total yield. Leaf macro- micro-nutrients were most increased under 500 mg soil-glycine application. Foliar spray of 500 ppm glycine resulted in better records than the other two levels, as spray of 1000 ppm glycine showed adverse and toxic effects including leaf necrosis. Fruit firmness was increased only by NPK and soil application of 500 mg glycine, whereas fruit vitamin C was increased by NPK fertilization, soil application of glycine at both levels (250, 500 mg) and foliar application of glycine at 500 ppm compared to control plants. The results indicate that soil application of 500 mg glycine/plant was able to improve leaf mineral and physiological characteristics towards higher yield and quality.

中文翻译：

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甘氨酸减轻了农作物的肥料需求：以黄瓜作为高肥料需求作物的案例研究

在没有化学肥料的情况下，已经采用了不同的方法来改善植物的矿质营养状况，从而获得更安全的产品并改善人类健康。在最近的不同研究中已经提出了具有这种作用的氨基酸。在这项研究中，与未经施肥的对照和NPK施肥相比，在温室条件下，将甘氨酸作为叶面（250、500和1000 ppm）或土壤（250和500 mg /植物）施用于黄瓜植物。结果表明，与对照相比，所有甘氨酸处理均增加了叶面积和植物的经济寿命。在每棵植物500毫克的较高浓度下施用甘氨酸能够产生与NPK施肥相同或更好的记录，特别是在叶片矿物质浓度，植物经济寿命和总产量方面。在施用500 mg土壤-甘氨酸的情况下，叶片的宏观微量营养元素增加最多。叶面喷洒500 ppm甘氨酸比其他两个水平产生更好的记录，因为喷洒1000 ppm甘氨酸显示不利和毒性作用，包括叶片坏死。与对照植物相比，仅NPK和500 mg甘氨酸在土壤中施用可增加果实硬度，而NPK施肥，两种水平（250、500 mg）在土壤中施用甘氨酸和500 ppm的甘氨酸叶面施用可提高水果维生素C 。结果表明，在土壤中施用500 mg甘氨酸/植物能够改善叶片矿物质和生理特性，从而提高产量和品质。因为喷洒1000 ppm的甘氨酸显示出不良和毒性作用，包括叶片坏死。与对照植物相比，仅氮磷钾和500 mg甘氨酸的土壤施用增加了水果的硬度，而氮磷钾肥，两种水平（250、500 mg）的甘氨酸在土壤中的施用和500 ppm的甘氨酸叶面施用都提高了水果维生素C 。结果表明，在土壤中施用500 mg甘氨酸/植物能够改善叶片矿物质和生理特性，从而提高产量和品质。因为喷洒1000 ppm的甘氨酸显示出不良和毒性作用，包括叶片坏死。与对照植物相比，仅NPK和500 mg甘氨酸在土壤中施用可增加果实硬度，而NPK施肥，两种水平（250、500 mg）在土壤中施用甘氨酸和500 ppm的甘氨酸叶面施用可提高水果维生素C 。结果表明，在土壤中施用500 mg甘氨酸/植物能够改善叶片矿物质和生理特性，从而提高产量和品质。