甘薯“冀审薯200001”氮磷钾吸收特性的研究

STUDY OF ASSIMILATION CHARACTERS OF SWEET-POTATO "JISHENSHU 200001"OF NITROGEN, PHOSPHORUS AND POTASSIUM

对“冀审薯 2 0 0 0 0 1”块根产量 4 890 0kg/hm2 水平下氮、磷、钾吸收特性进行了研究。结果表明 :每生产 10 0 0kg鲜薯 ,植株需吸收N 7.5 8kg ,P2 O52 .64kg ,K2 O 11.4 7kg ,其比例为 1.0 0∶0 .3 4∶1.5 1;栽秧后 5 5～ 81d是植株吸收各种养分最多的时期 ,分别占植株总吸收量的 5 2 .95 % ,4 5 .83 % ,5 5 .69% ;不同生长时期各器官中N、P2 O5、K2

The assimilation character was studied of 'JishenShu 200001' of N, P and K, the yield of this potatoe variety being 48 900 kg/hm 2. The result showed that 7.58 kg N, 2.64 kg P 2O 5 and 11.47 kg K(the ratio was 1.00∶0.35∶1.51) were needed to produce every 1 000 kg fresh root tubers and 55～81 days after plantation were the peak period for plants to assimilate N, P 2O 5 and K 2O, each of which accounted for 52.55%, 45.83% and 55.69% of the total assimilation respectively. The content and assimilation of N, P 2O 5 and K 2O in each organ greatly varied with growing periods.