Composition and dose of ameliorant against C/N ratio, soil PH, plant phosphate content on potato plants

This article aims to learn the addition of ameliorant material on the ground so as to increase the level of soil fertility especially for the potato plants that are buenabled on the medium plains. The experiments were conducted on medium plains with a height of 750 m above sea level in Jatinangor area, Indonesia with land type Incepticol. The composition of ameliorant consists of chicken manure, coconut shells and dolomite biochar. The seeds of the potatoes used are relatively good varietal when cultivated in a medium plain. The design of the environment used is the group's random draft repeated 3 times, the treatment design consists of K 0 : control; K 1 : Cattle manure 10 ton ha -1 ; K 2 : Cattle manure 20 ton ha -1 ; K 3 : Cattle manure 8 tons ha -1 , dolomite 1 ton ha -1 , 1 ton ha -1 biochar; K 4 : Cattle manure 16 tons ha -1 , dolomite 2 ton ha -1 , 2 ton biochar ha -1 , K 5 : Cattle manure 8 tons ha -1 , dolomite 2 ton ha -1 ; K 6 : Cattle manure 16 ton ha -1 , dolomite 4 ton ha -1 ; K 7 : Cattle manure 8 tons ha -1 , biochar 2 ton ha -1 ; K 8 : Cattle manure 16 ton ha -1 , biochar 4 ton ha -1 . Results showed that the composition and dose of ameliorant able to increase the value of soil pH, but have not been able to improve the C/N ratio and absorption of phosphorus plants. Best result obtained from the treatment of Cattle manure composition 16 ton ha-1, dolomite 2 ton ha-1, 2 ton ha-1 biochar. Soil pH is capable of increased by 16.83% and the size of the potato bulbs of Class L (450-550 mm) amounted to 35, 11%, size M (350-450 mm) by 25.89% and size S (200-350 mm) amounting to 34.37% when compared with controls