Tanggapan beberapa varietas/galur sorgum terhadap pengapuran dan pemupukan fosfat pada tanah podsolik merah kuning.
1991
Rahardjo M. | Fathan R.
The characteristics of Red-Yellow Podzolic soils include low pH, extremely low P and usually high in exchangeable aluminum. Sorghum is sensitive to acid soils high to exchangeable aluminum. Sorghum varieties differ in their response to exchangeable aluminum. To collect information on the response of sorghum varieties to lime and phosphate on acid soil high in exchangeable aluminum, a factorial pot experiment was conducted in the green house of Bogor Research Institute for Food Crops. The soil was collected from Jasinga (Bogor), acid in reaction (pH 4,32), and high in excheangable aluminum (18,7 me/100 g dry soil). Sorghum varieties Keris No.311, CS. 100 and UPLSG-5 were used as indicator plants. The treatments were without lime nor phosphate fertilizer, phosphate fertilizer without lime, and phosphate fertilizer with lime. The phosphate fertilizer rate was 100 ppm P2O5 as TSP, lime rate was 1 X exchangeable aluminum, and all treatments were applied with 200 ppm N as Urea and 100 ppm K2O as KCl. Sorghum was harvested 40 days after planting to record plant growth and nutrient absorption. Keris and No.311 varieties were responsive to phosphate and lime, plant growth and N, P, K, Ca absorption increased significantly. Keris and No. 311 varieties grew well on acid soil if fertilized with phosphate and limed. CS.110 variety did not respond to phosphate and lime and therefore not suitable for acid soils. UPLSG-5 variety was responsive to phosphate but not to liming. Plant growth and N, P, K, Ca absorption were similar to Keris and No. 311, which were fertilized with phosphate and lime. UPSLG-5 variety grew well on acid soil and therefore suitable for acid Red-Yellow Podzolic Soils.
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