Abstract
Phosphorus (P) is an important nutrient and often has problem both in its availability in soil and in its supply, therefore direct application of rock phosphate is a prospective alternative. The objective of this research is to study the effect of varied organic matter source on the availability of phosphate derived from soil and rock phosphate. The experiment was laid experimentally in splitplot design and environmentally in randomized complete block design. The main plot was source of P consisted of, control, SP-36 and rock phosphate in dosage of 200 mg P2O5 per kg of air dry soil. Source of organic matter as sub-plot consisted of control (no organic matter), cow dung, cocoa pod husk compost and sugar cane filter cake, each in dosage of 2.5 and 5.0%. Result of this experiment showed that both P and organic matter application affected soil P availability. Application of cow dung and filter cake increased the soil P availability but did not increase the rock phosphate solubility. On the other hand, application of cocoa pod husk did not increase neither soil P availability nor rock phosphate solubility. Filter cake produced higher soil P availability, whereas cocoa pod husk compost produced the lowest which was similar to control (no organic matter). Application of organic matter tended to increase soil pH, exchangeable Ca and available Fe. Changes of available Fe positively correlated with available P. Key words : availability of phosphorus, rock phosphate, organic matter
Highlights
Source of organic matter as sub-plot consisted of control, cow dung, cocoa pod husk compost and sugar cane filter cake, each in dosage of 2.5 and 5.0%
Chemichal composotion for cow dung, cocoa pod husk compost and sugar cane filter cake are used in this research
Catatan (Notes): angka-angka dalam kolom yang sama yang diikuti oleh huruf yang sama menunjukkan berbeda tidak nyata menurut uji Tukey 5%. (Figures in the same column followed by the same letter(s) are not signifantly different to Tukey at 5% level)
Summary
Ketersediaan Fosfor asal Tanah dan Fosfat Alam Akibat Sumber Bahan Organik yang Berbeda. Sebagai petak utama adalah sumber P terdiri atas tanpa P, SP-36 dan fosfat alam dengan takaran 200 mg P2O5 per kg tanah kering angin. Sumber bahan organik sebagai anak petak terdiri atas tanpa bahan organik, pupuk kandang sapi dengan takaran 2,5 dan 5,0%; kompos kulit buah kakao dengan takaran 2,5 dan 5,0%; belotong dengan takaran 2,5 dan 5,0%. Hasil penelitian menunjukkan bahwa perlakuan pupuk dan bahan organik berpengaruh terhadap ketersediaan P tanah. Aplikasi pupuk kandang dan belotong dapat meningkatkan ketersediaan P dalam tanah namun belum dapat meningkatkan kelarutan fosfat alam. Aplikasi kompos kulit buah kakao tidak dapat meningkatkan ketersediaan P maupun kelarutan fosfat alam. Belotong menghasilkan kadar P tersedia dalam tanah tertinggi, sedangkan kompos kulit kakao terendah yang tidak berbeda dengan kontrol.
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