Phosphate Solubilization Agents in Increasing Potatoes Production on Andisol Sinabung Area
Sutarta, Edi Sigit
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Background and Objective: Andisols has relatively low phosphorus availability due to its adsorption by allophane. Microbial phosphate solubilization and organic matter are capable of producing organic acids that play a role in increasing the phosphorus (P) availability. Phosphorus-solubilizing activity is determined by the ability of microbes to release metabolites such as organic acids, which through their hydroxyl and carboxyl groups chelate the cation bound to phosphate, the latter being converted to soluble. This study was aimed to obtain the best type of phosphate solubilization agents (microbe and the organic matter) to increase P uptake and yield of potato (Solanum tuberosum L.). Materials and Methods: The research was conducted in Kutarayat village, Naman Teran District with a thickness of ash <2 cm (thin) and the altitude of 1400 above sea level. The design used was factorial randomized block design. Factor I was microbial phosphate solubilization (Burkholderia cepacia, Talaromyces pinophilus and Burkholderia cepacia +Talaromyces pinophilus ). Factor II was fresh organic matter/undecomposed (chicken manure, cow dung, paddy straw and Tithonia diversifolia ) applied 2 t haG1. Parameters observed were dry weight to plant, P uptake were measured at the end of vegetative phase and crop production weighed. Data was analyzed using SAS computer programs and comparison of means were tested for significance using Least Significant Difference (LSD ) (p<0.05). Results: Production of potato tubers (g per plant) increased 2.4% caused by application of T. pinophilus alone without cow dung compared to control. Application of cow dung alone increased potato production and quality. The applications of organic matter increased the mass of potato tubers in category A by 17.15-41.45%. Cow dung increased number of tuber size category A (100 g per tuber) 41.45% higher than controls. Tuber weight category D (<15 g per tuber) at treatment of cow dung was lower 30.37% compared control. Meanwhile, application of both treatments increased tuber production and quality higher than the single treatment either T. pinophilus or cow dung. Conclusion: It is concluded that application of T . pinophilus and cow dung increased P uptake (62.88%), growth and yield of potato (53.73%) higher than without applying microbe and without adding organic matter.