Effect of Straw Compost and Phosphorus and Zinc Fertilizer on The Content of Phosphorus and Zinc in Paddy
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The main ploblem on the wetland experiencing iatensive phosphorus (P) fertilization was low nutrien! availability of zinc (Zn), while Zn fertHization was rarely done. Organic fertilizer wal': known to be able (0 increase the availability of micT~mulrienL The study of tile effect of straw compost in relation to Zn nutrient is 5till very limited. The purpose of this study was to evaluate the effect of the inter~tion of P and Zn fertilizers and straw compost on the content P and Zn in rice. This resear:;h WllS conducted in March to June 2016 in the greenhouse of Facul!y of A~culture, University of North Sumatera. This study used a randomized block design factorial. TIle first facw was dosage of super phosphate (SP}-36 fertilizer consisted of 0, 150, 300, anc! 450 kg . ha-1, The second factor was ZnSO. fertilizers consisted of(O, 25, 50, 75 and 100) kg • ha- 1• 1be third factor was the straw compost consisted of (0 and 10) t . ha- 1• The results sh()Vo'e(! that paddy soils with high P content were not affected by P ar.d Zn fertilizer. Straw compost application in particular on the condition without P fertilizer increased the COntent of P and Zn in legves. Zn Fertilization with dosage up to 100 kg . ~a-l and P fertilization up to 300 kg . ha- 1 SP-36 did not affect the ronten! of P in leaves but decrease levels of Zn in leaves. The dosage 450 kg . ha- 1 of SP-36 and Zn fertilization increase the content of Zn in leaves.