Phosphate fertilizer efficiency on soybean yield performance of peaty soil
1997
Supriyo, A. | Dirgahayuningsih, R. (Balai Penelitian Tanaman Pangan Lahan Rawa, Banjarbaru (Indonesia))
The dominant soil type in tidal swamps area is peat/peaty soils, this extent was 18 millions ha. Soybean development of tidal swamps area mainly on C, D type. One major constraint of soybean development was high degree soil acidity, this resulted in high P nutrient fixation so that low productivity. Distribution of kind and content of phosphate fertilizer, also continued in usages to cause a high cost of production. Because of its to need studied of kind and dosages of P application in along time so achieved in efficient technology of P application. Residual effect P fertilizer was conduct to studied of sources and dosages P applications on soybean yield performance on peaty land. Experiment site of Suryakanta village, Batola regency during three seasons from 1995 WS to 1996 WS. Factorial experiment was arranged in RCBD with three replications. First factor (three phosphate sources) i.e TSP, SP 36 and Phosphate rocks (RP). Second factor (four levels of P dosage i.e 45; 90; 135 and 180 kg P2O5/ha. P fertilizers apply one time before planting, and basal fertilizer are 30 kg N + 50 kg K2O/ha for each seasons. Research resulted showed that residual effects of P fertilizer to increase shoot dry weight, nodule fresh weight, total P-plant content, until to second season, source of P (RP and SP 36) better than TSP, can increase pod filling numbers, this supported by the highest of soil P-available (avl) content and nodule fresh weight. Decrease of soil P-avl of RP and SP-36 more stable until third season compared to TSP, so that status of soils P-avl decrease under critical levels (less than 5 ppm P). RAE of rocks phosphate (RP) to increase 3-7 times compared to TSP in third season. Nevertheless in first season RAE value of RP and SP 36 less than TSP at 45 kg P2O5/ha levels, but the residual effects of P fertilizer during two seasons (MK 1995-MH 1996/97) RAE of RP higher than SP 36, with value ranges 132-375 and 125-167 respectively
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