Corn (Zea mays L) is cereal crop that has strategic and economic value and can be developed as a major source of carbohydrates, vitamins and minerals as well as animal feed and industrial raw materials. The main purpose of the research is to improve the growth and production as well as the quality of the local yellow Manado corn, thus the research is conducted: (1) To obtain the optimum dose of fertilizer N and K which can improve the growth, yield and nutritional quality of maize; (2) To get a proper application time of urea to be done and tillage on growth, yield and nutritional quality of maize. Application of urea and KCl increase the growth and yield of corn. Urea-dose combination of 300 kg ha-1 + KCl 100 kg ha-1 results in the highest growth and
yield of corn. Urea-dose of 300 kg ha-1 results in the highest dry shelled yield weight per hectare of of 3.24 t ha-1 , a KCl-dose of 100 kg ha-1 results in dry shelled weight of 2.89 t ha-1 . Urea-dose combination of 300 kg ha-1 + KCl 100 kg ha-1 results in the highest carotenoid and sugar content, respectively: starch of 65.10%, sugar and carotene content of 5.37% 2.03 mg/g. The combination of the use of 300 kg ha-1 urea and 100 kg ha-1 KCL, as well as cultivated and nurtured land as much as 2 times at 15and 45 days after planting and at planting 3 times, 30 DAT and 45 DAT results the highest growth, yield, nutritional quality. Therefore, the related studies to the regulation of fertilizer N and K is tested at sites with different heights.
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Author Name: Anatje Lihiang
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Keywords: Utilization, fertilizer, Production, Yellow Manado Corn