Kelarutan Fosfat dan Ferro pada Tanah Sulfat Masam yang Diberi Bahan Organik Jerami Padi

Abstract

The objective of this research was to investigate the effect of application of organic matter from rice straw (RS) on phosphate and Fe2+ solubility in the acid sulphate soils. The research was conducted in the glass house consisting of the three treatment factors using the completely randomized design with three replication. The first factor was soil condition : continuous application of RS and without application of RS during the last 5 years. The second factor was fresh application of RS ; with application and without application, whereas the third factor was phosphate application consisting 3 rates of SP - 36 fertilizers (0.5; 1,0 and 1.5 of application dossage). The result showed the three factors interaction had a significant influence on soil pH at 2 weeks after planting, whilst interaction between RS application and soil condition had a significant influence on soil pH, available phosphate at 4, 6 and 8 weeks after planting. The interaction between RS application and phosphate fertilizers rate had a significant influence on soil pH 4 weeks after planting, and on available phosphate at 8 weeks after planting. The main effect of RS application was significant on exchangeable Fe and soil pH at all observations periods.

Efektivitas Berbagai Bahan Formula Pupuk Hayati Sianobakteri Terhadap Pertumbuhan Dan Hasil Padi Gogo Varietas Situ Bagendit

“…Zhang et al (2012) dan Jones et al (2012) menemukan bahwa tingkat aplikasi biochar 10 dan 40 t ha -1 peningkatan pH sekitar 0,2 dan 0,4 unit, mirip dengan peningkatan pH 0,3 unit yang mengikuti 50 t ha -1 aplikasi. Hasil penelitian Fahmi et al (2004) juga meunjukkan peningkatan kualitas tanah dengan pemberian bahan organik diakibatkan perbaikan sifat kimia tanah seperti pH yang meningkat dan menurunnya kandungan Fe.…”

Impact of Land Reclamation on Acid Sulfate Soil and Its Mitigation

“…It can be affected by monosulfide or sulfuric materials. Acid sulfate soil has very low soil pH (2.5 -3.5), low nutrient, and base saturation (Table 1), and it contains toxic materials such as Aluminum (Al) and iron (Fe) if the concentration is too high in soil [2]. High Aluminum's and iron's content affected the availability of Phosphor (P), and other nutrients such as Calcium (Ca), Potassium (K), and Magnesium, in acid sulfate soil.…”

“…Figure 5. The effect of organic material quality on the dynamics of pH changes in acid sulfate soils [2,22].…”

FRAKSI BESI DAN PENGARUHNYA TERHADAP KELARUTAN POSFOR DI LAHAN RAWA (Iron Fraction And Its Effect On Posforning Sustainability In Rawa Land)

“…Besi adalah salah satu kation logam yang dominan ditemukan di lahan rawa, khususnya di tanah sulfat masam.Selain sebagai unsur mikro essential bagi tanaman, besi berpotensi menjadi unsur beracun bagi tanaman bila dalam konsentrasi yang tinggi. Menurut Doberman dan Fairhurst (2000) tanaman padi dapat mengalami keracunan pada konsentrasi 500mg kg -1 , di tanah sulfat masam konsentrasinya dapat mencapai 4500 ppm (Fahmi et al, 2009). Selain itu, keberadaan besi di tanah sulfat masam dapat menyebabkan kekurangan hara P bagi tanaman.…”