Effect of Amount of Nitrogen Fertilizer on Early Growth of Leafy Vegetables in Thailand
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概要
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The optimum rate of fertilizer application and harvest date for the production of three leafy vegetables were investigated in a nylon net house (16 meshes) from October to December at the Tropical Vegetable Research Center (TVRC), Kasetsart University, Kampaengsaen Campus, Nakhonpathom, Thailand. Three kinds of leafy vegetables were used: 1) Kale (<I>Brassica oleracea var. alboglabra</I>), 2) Pakchoi (<I>Brassica papa var. chinensis</I>) and 3) Green petiole (<I>Brassica chinensis var. chinensis</I>) . The experiment enabled to determine the effects of nitrogen application on the growth and nitrogen use efficiency of leafy vegetables. The three leafy vegetables were grown at 4 levels of nitrogen fertilizer (156, 312, 468 and 625 kg ha<SUP>-1</SUP>) . For Kale, pakchoi and green petiole, the fertilizer efficiency was best at the nitrogen fertilizer rate of 156 kg ha<SUP>-1</SUP>. The optimum harvest time was 35 DAS for kale and pakchoi, and 28 DAS for green petiole.
- 日本熱帯農業学会の論文
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