Influence of nitrogen on sown and ratooned upland kangkong (Ipomoea aquatica Forsk.) at two planting densities.

摘要: Kangkong cv. Large Leaf was grown in a glasshouse at 2 densities (20 or 44 plants/msuperscript 2) and 4 rates of N as calcium ammonium nitrate. The crop either ratooned (5 crops) cut resown (3 starting 6 weeks after sowing. Increasing the rate application from 100 kg/ha to 250, 500 750 increased total 18 by 3.8, 5.1 6.1 kg/msuperscript 2, respectively, nitrate content 599 mg/kg fresh weight 3812 kg/ha; stems had higher than leaves. high plant density gave 3 greater yield low density, ratooning 5 resowing method. (Abstract retrieved CAB Abstracts CABI’s permission)