密度和施氮量对沿海滩涂中度盐碱地蓖麻产量和氮素吸收的影响

Effects of density and nitrogen application amount on yield and nutrient absorption of castor plant grown in saline soil along coastal mudflat

以淄蓖5号和云蓖泰国202为材料,研究沿海中度盐碱地不同种植密度和施氮量对蓖麻产量和氮素吸收利用的影响。结果表明,淄蓖5号在种植密度13 000株.hm-2、施氮量120kg.hm-2条件下获得的产量最高,云蓖泰国202的适宜密度为16 000株.hm-2、施氮量为120kg.hm-2。两个品种苗期对氮的吸收速率均缓慢,吸收量较低,蕾期吸收速率和吸收量逐渐增加,开花期达到高峰。高产条件下,每生产100kg的蓖麻籽淄蓖5号需氮9.93～10.33kg,云蓖泰国202需氮8.25～10.12kg。在苗期、蕾期、开花期、花果期和灌浆成熟期,淄蓖5号分别保持2%、15%、50%、15%和20%左右的氮吸收百分率有利于高产;云蓖泰国202分别保持1%、10%、45%、12%和30%左右的氮吸收百分率有利于高产。

Planting density and nitrogen are essential factors affecting growth and yield of effects of planting density and nitrogen application amount on castor yield and nitrogen absorption Zibi 5 and Yunbi TCO -202 （Ricinus ccommunis L. ） grown in medium saline soil were studied. density was 13 000 plant· hm^-2 and nitrogen application amount was 120kg·hm^-2 ,the highest castor plants. The in castor plants of When the planting yield was obtained in Zibi 5. The highest yield was achieved for Yunbi TCO -202 when the planting density was 16 000 plant·hm^-2 and nitrogen application amount was 120kg ·hm^-2 . To produce 100 kg castor seed in Zibi 5, 9.93 - 10.33kg nitrogen was needed. 8.25 - 10.12kg nitrogen was needed to produce 100kg castor seed in Yunbi TCO -202. When the percentages of nitrogen absorption at seedling stage, budding stage, flowering stage, fruiting stage, and grain fill- ing and ripening stage were kept at 2% , 15% ,50%, 15% and 20% respectively, high yield was obtained in Zibi 5. When the percentages of nitrogen absorptiont were kept at 1%, 10% ,45%, 12% and 30% at the repsective stages above, high yield was obtained in Yunbi TCO -202.