Effect of level of manure application on leaf and tiller growth in pot-cultured napiergrass (Pennisetum purpureum Schumach)
2007
Hasyim, H.(Polytechnic Technology Negeri Ujung Pandang, Makassar (Indonesia)) | Wadi, A. | Idota, S. | Ishii, Y.
To determine growth rates of napiergrass (Pennisetum purpureum Schumach) as affected by mineralized nutrients from applied manure, leaf and tiller growth and growth parameters of a plant were determined under several levels of manure application in a pot-cultured condition from June to September. With the increase in manure application, leaf growth was promoted primarily by the increase in tiller number and total expanded leaf number per shoot, but not by the increase in percentage of live leaf. With the increase in manure application, tiller growth increased by the increase in tiller number and mean tiller weight, up to the medium level (4 kg/square m) of manure application. For dry matter partitioning in a plant, ratio of leaf blade to stem inclusive of leaf sheath and that of top to root (T/R) decreased with time, except for the T/R in early June, and were not affected significantly by the level of manure application. The increases in leaf and tiller growth with the increase in manure application lead to the increase in leaf area index (LAI), with which crop growth rate (CGR) was linearly related across a whole range of LAI. Highest CGR in the warm summer season in manure application was mediated with the stable net assimilation rate in a range of LAI, suggesting the higher rate of mineralization from manure.
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