Fertilization on the Bentgrass putting greens of different permeability.

概要

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1. This work was undertaken to establish the method of fertilizer application on the Bentgrass putting greens of three different permeabilities (about 100, 300 and 600mm/hr) in 1984 and 1985 at Fuji Oyama Golf Course in Shizuoka Prefectu re. Slow-release nitrogen fertilizer, CDU was mainly applied and the rate of N dosage per year was around 30 gN/m2. Vermiculite (2.7 kg/m2) and zeolite (5 kg/m2) were added mainly to the bed soil of 90% of sand to improve its water-holding and cation-exchange capacities. Total nitrogen (T-N) content of cutted grass from these greene was analyzed throughout the two years' seasons to evaluate the effect of fertilization. 2. The results of T-N derterminations were as follows ; In 1984, the mean of T-N of 42 samples was 5.73% with the standard deviation (SD) of 0.53 and the coefficient of variation (CV) of 9.2. In 1985, the mean of T-N of 45 samples was 6.19% 0o with SD of 0.40 and the CV of 6.4. The variation of T-N could be reduced by the equalization of the amount, distribution of N application in this year. In 1984 and 1985, the mean of T-N of all 87 samples was 5.96% with SD of 0.52 and CV of 8.7. 3. These results suggest that Bentgrass on putting green of high permeability can be grown in a same manner as that of low permeability by the application of slow-release fertilizer and the addition of soil amendments (vermiculite and zeolite) of high CEC to bed soil.
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