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《Acta Pratacultural Science》 2004-05
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Effects of N, P, K and their combinations on dry matter accumulation of Paspalum notatum

LI De-rong~1, SHU Jian-min~2, CHENG Jian-feng~1, DONG Wen-da~1, MEI Zong-huan~3, LIU Bai-gen~3 (1.College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China; 2.Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 3.Soil and Water Conservation of Ningdu Country, Ningdu 341700, China)  
On the basis of simple application of N, P and K in 1999, effects of four combined applications of N, P and K on dry matter (DM) accumulation of Paspalum notatum were studied in 2000. The results showed that dry matter accumulation had significant responses to N+P+K, N+P and N+K applications and reached (14.61), 14.34 and 13.80 t/hm~2 respectively. The combined applications were better than the simple application of N, P, K or P+K in terms of DM increase. The relations between dry matter accumulation and growing days could be well simulated by "S" curves. The optimal growth stage of increasing dry matter was around 125 days after germination. The increase in dry matter accumulation was higher with the applications including N than that of the application without N during that stage. Thus N played the most important role in dry matter accumulation. P had better effect on DM accumulation than K. The relations between the amount of dry matter accumulation (Y) and growing days (X) for different N+P+K combinations could be modeled by Logistic (equations) with significant correlation coefficients (P0.01). The equations can be used to predict the dry matter accumulation under different fertilizer regimes. The analysis by logistic growth curve indicated that the N fertilizer was the key factor to DM accumulation mainly by significantly increasing the days of linear phase of growth and decreasing the days of logarithmic and senescence phase of growth.
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【CateGory Index】: S54
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