N, P and K fertilization, absorption, yield and quality in mat rush production at Yatsushiro, Kumamoto prefecture [Japan].
1992
Hasegawa T. | Oshima K. | Katano M.
Yatsushiro, Kumamoto Prefecture is the biggest mat rush (Juncus decipiens Nakai) production area in Japan that covers about 80 % of the national production. The cultivation here highly depends on heavy fertilizer application. The objective of this study is to clarify the fertilizer efficiency of N, P, and K by means of uptake: application ratio and the influence of these elements on yield and quality of mat rush. Thirteen paddies differing soil texture (Sandy Loam to Light Clay) were investigated. Yield and uptake were highly correlated (p < 0.01 for N and P; p < 0.05 for K) but no significant relationship was found between uptake and application excepting P. The uptake: application ratios were about 33 % for N, 26 % for P and 75 % for K. A negative correlation was observed between N and K concentration of above ground stem and 10 stem weight for 120 < 130 cm and 90 < 120 cm stem length. It was suggested that the uptake of these elements is linearly associated with yield but that heavier fertilization does not guarantee the higher absorption. Higher N and K concentration of stem can adversely affect 10 stem weight, which is important in mat rush quality.
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