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对杂交水稻Ⅱ优 ４６ 不同氮肥用量的经济效益分析表明，当 ６６７ ｍ ２ 尿素用量为 ２５．３９ ｋｇ 时，产量最高，用量为 ２２．５８ ｋｇ 时，经济效益最好。
The economic benefit analysis on the amount of nitrogen fertilizer used in hybrid rice II You 46 showed that when the dosage of 667 m 2 urea was 25.39 kg, the yield was the highest. When the dosage was 22.58 kg, the economic benefit was the best.