The combination effect of straw, K fertilizer and lime on iron toxicity in lowland rice in acid sulphate
1997
Darmajaya, D.I. | Hermawan, A. (Universitas Sriwijaya, Palembang (Indonesia). Fakultas Pertanian)
Acid sulphate soil is very potential to be developed for lowland rice plantation, but there was some problems especially caused by Fe toxicity. Therefore, this research was to see the effect of K fertilizer (from KCl and rice straw) combined with lime on Fe toxicity of lowland rice on acid sulphate soil, in order to increase the efficiency of fertilization and the land productivity. The experimental design used in this research was factorial randomized block design with two factors and three replications. The first factor was K fertilization with 6 levels: (K0: 0 kg K2O/ha, K1: 30 kg K2O/ha, K2: 60 kg K2O/ha, K3: 90 kg K2O/ha, K4: 2 ton rice straw/ha, K5: 4 ton rice straw/ha. The other factor was liming with 3 levels (L0: 0 ton CaCo3/ha, L1: 2 ton CaCo3/ha, and L2: 4 ton CaCo3/ha. The observation were made on the plant, the growth and dry biomass of plant 6 weeks after planting. The results showed that K fertilizers significantly increased the available of total K soil, and concentration K-plant and tended to decrease soil available Fe soil and the concentration Fe-plant. Fertilization of K significantly increased the growth and plant biomass. Liming significantly increased soil pH, but had no effect on the other parameters. The highest dry biomass was achieved by K3L0 (120 K2O/ha and without lime). Kalium fertilization potentially decreased Fe toxicity in acid sulphate soil
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