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叶色法确定氮的追肥 *  如果 SPAD> 37,  施用 20 kg N /hm 2 ; 35<SPAD<37,  施用 30 kg N /hm 2 ,  SPAD<35,  施用 40 kg N /hm 2 ; **   如果 SPAD>37,  施用 30 kg N /hm 2   ; 35<SPAD<37,  施用 40 kg N /hm 2 , SPAD<35,  施用 50 kg N /hm 2 ***   对于光温气候好的年份,如果抽穗期 SPAD 测定值小于 37 ,则施用 20 kg N /hm 2 . (本实验采用方法) 施肥次数 时期 施氮比例( % ) 氮肥用量( kg/hm 2 ) SPAD 1 基肥 35 42 2 分蘖期( 2 周) 20 30±10 * 3 幼穗分化( 5-6 周) 30 40±10 ** 4 抽穗期( 8 周) 15 0 or 20 *** 合计 100 110-160
氮肥的用量和时期( kg N /ha ) 处理 总量 N1 N2 N3 对照 0 0 0 0 传统 146 73( 基肥 ) 73( 蘖肥 , 移栽 10 天后 ) / 优化 119 42( 基肥 ) 40( 蘖肥 , 移栽 14 天后 ) 37( 穗肥 , 移栽 40 天后 )
三角栽培技术
三苗三角 三苗丛栽
不同处理水稻生物量和氮素累积量曲线 Opt 处理增加了水稻生育后期(从灌浆期开始)的生物量累积和氮素吸收
不同处理的水稻籽粒产量和产量构成 a 同一列中带有相同字母表示不同处理在 0.05 水平差异不显著
2004 6 26 传统 优化 农民 1 农民 2 农民 3 农民 4 试验田 8560 6622 7600 6900 6523 6500 6936
a   试验区农民地块的平均( n=30 ) b   小区试验结果  水稻养分资源综合管理体系在区域水平的节氮与增产潜力   施氮量 ( kg/hm 2 ) 产量 农民 习惯 a 156 6890 综合管理 b 120 8560 增 / 减( % ) - 24 +24 kg/hm 2 )
雁江区中和镇 2007 年推广 5000 余亩 在四川丘陵区大面积推广应用

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