Development of fertilizing programs for forage crop culture of environmental conservation type, 4: On an application amount of a coated fertilizer from which urea is slowly released
2004
Naganawa, T. (Gifu-ken. Livestock Research Inst., Kiyomi (Japan)) | Asai, H. | Taguchi, K. | Toyota, Y.
A coated fertilizer from which urea is slowly released was used for basal dressing in amounts of 0 kg/a, 1 kg/a and 2 kg/a in terms of nitrogen (N) for growing of a variety of corn, 35Y65. Unplowed seeding was used in the experimental field that was not composted. The growth and dry matter yield of the corn were examined and analysis of soil water was performed at a 20d-interval for environmental assessment. The fertilizer had a desired effect on corn's growing, and no difference between the 1 kg/a and 2 kg/a treatments was detected in the leaf color culm length, earing height, stalk diameter, sugar content and dry matter yieled,suggesting that the smaller amount of the fertilizer provides a sufficient corn crop yield. Even after the fertilizer use in 2 kg/a, the nitrate N content of soil water was up to 40 ppm at 30 cm under the ground and less than 15 ppm at 50 cm under the ground. It can be assumed from the reduction rate that at 1 m under the ground the content may be well below the content limit of 10 ppm by the Water Pollution Control Low. In a combined use with cattle manure compost (4 t/a). the cost of the coated urea (1 kg/a) was estimated to be lower than that of available compound fertilizers (in amounts providing the same crop yield as 1 kg/a of the coated urea) . In conclusion, the coated urea is less expensive and less harmful to the environment than conventional compound fertilizers.
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