Pemanfaatan Tithonia Diversifolia pada Tanah Sawah yang Dipupuk P Secara Starter terhadap Produksi serta Serapan Hara N, P, dan K Tanaman Padi

Abstract

The research of Tithonia diversifolia utilization in the paddy soil that was fertilized P-starter on yield and N, P, K uptake on rice crop, has been conducted from August to December 2005.  The objective of this research was to determine interaction between P-starter levels, and tithonia levels on production and N, P, K element uptake of rice crop. The research was pot experiment in the green house in factorial design 4 x 4.  First factor was 4 levels of tithonia with reduce dosage fertilizer aplied (T₀ = 0 t tithonia + 200 kgUrea ha^-1 + 75 kg KCl ha^-1; T₁= 2,5 t tithonia ha^-1 + 150 kg Urea ha^-1, without KCl; T₂ = 5,0 t tithonia ha^-1 + 100 kg Urea ha^-1, without KCl; dan T₃ = 7,5 t tithonia ha^-1 + 50 kg Urea ha^-1, without KCl).  The second factor was 4 levels of P-starter (0, 2, 4, and 6 kg P ha^-1).  The result showed that combination T₃ treatment and 2-4 kg P-starter ha^-1 increased the grain yield 20,51-21,08 g pot^-1 (18,65-19,21%). Effect of T₃ treatment was not significant with T₂ treatment on the grain yield.  The best interaction was T₃ treatment on N and K uptake ((0,84 g pot^-1 for N, dan 0,82 g pot^-1 for K).