Effects of the level of fertilizer input on dry matter productivity of two varieties of napiergrass (Pennisetum purpureum Schumach)
1999
Sunusi, A.A. (Miyazaki Univ. (Japan). Faculty of Agriculture) | Ito, K. | Ishii, Y. | Ueno, M. | Miyagi, E.
For the purpose of clarifying the desirable plant characteristics under heavy fertilization, dry matter productivities of napiergrass (Pennisetum purpureum Schumach) at the first year were compared between two varieties (cv. Wruk Wona and cv. Merkeron) under three levels of chemical fertilizer input at the rates of 1200, 600 and 120 kgN/ha during the growing season from middle May to middle November. The dry matter weight of whole plant (TDMW) in Wruk Wona steadily increased with the increase in fertilizer input, while that in Merkeron showed a saturated response to fertilizer input from the medium to the highest level. These variations of TDMW were similar to the variation of leaf area index (LAI), and the latter was due to the variations in the producing rate of new leaves. The increase of fertilizer input under the medium to the highest level did not cause the increase of total expanded leaf numbers per shoot in Merkeron, but did in Wruk Wona. Thus, the increase of leaf number in response to the increase of fertilizer input level and the decrease of light extinction coefficient concurring with the increase of LAI were inferred to be the plant factors that brought about the productivity increase under high input level of fertilizer such as Wruk Wona
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