为了探索水稻根系调控途径 ,采用春曰井配方设置不同 NPK剂量的营养液 ,培育杂交水稻汕优 6 3。试验结果表明 ,适中的 NPK养分 (每升培养液含 N 2 0 mg、 P 4 .4 mg、 K 16 .6 mg)根系萌发多 ,活力强 ;低剂量的 NPK养分 (剂量为适中养分的 1/2 )可诱导稻根竞争性伸长 ;高剂量的 NPK养分 (剂量为适中养分的 2倍 )则抑制稻根伸长 ;前中期交替变换中 /低剂量的 NPK养分 ,既促进上、下层冠根和分枝根的萌发又诱导冠根伸长 ,显著增加了根系总长、体积、干重和活力 ,大幅度提高产量。后者与持续适中养分水平的处理相比 ,根系总长、体积和干重分别增长 12 7%、 10 2 %和 90 % ,齐穗期的 α- NA氧化量增加 6 7% ,稻谷产量提高 19%。说明通过调节养分供应 ,可以有效调控水稻根系的形态和机能 In order to explore the ways of root regulation of rice, the nutrient solution with different doses of NPK was set by using Spring Well formula and the hybrid rice Shanyou 6 3 was cultivated. The results showed that moderate NPK nutrients (N 2 0 mg, P 4 .4 mg and K 16 .6 mg per liter of culture medium) germinated more vigorously and had stronger vitality. Low dose NPK nutrients (medium dose 1 / 2) could induce competitive elongation of rice roots; NPK nutrition (2 times of the moderate nutrition) inhibited the elongation of rice roots; and medium to low doses of NPK nutrients were alternately transformed in the early and middle stages, The crown root and branch root germination induced the crown elongation, which significantly increased the total root length, volume, dry weight and vigor, and significantly increased the yield. The latter increased 12.7%, 102% and 90% of the total root length, volume and dry weight, respectively, compared with the continuous medium nutrient level, increased the amount of α-NA oxidation at the heading stage by 67.7% and increased the rice yield by 19% %. This shows that by regulating nutrient supply, the morphology and function of rice root system can be effectively regulated