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Articles by Mariani Sembiring
Total Records ( 2 ) for Mariani Sembiring
  Mariani Sembiring , Deni Elfiati , Edi Sigit Sutarta and T. Sabrina
  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 ha–1. 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.
  Mariani Sembiring and Fauzi
  Background and Objective: Deficiency of Phosphorus (P) in soil results in reduction of food production since all plants require an adequate supply of P for its growth and development. The availability of phosphorus in Andisol soil is very low only circa 0.1% of the total soil P. Phosphate solubilizing microbes can increase soil available P so that growth and crop production can be increased. This study aims to find a type of superior microbe that is able to increase the availability of phosphorus and potato production on Andisol Sinabung area. Materials and Methods: This study was conducted in Kutarayat village, Naman Teran District. The research design used in this study was a randomized block design non factorial with three replications, as for the treatment being tested is without application of microbial solubilization phosphate (M0), Burkholderia cepacia1 (M1), Bacillus licheniformis (M2), Burkholderia metallica (M3), Burkholderia cenocepacia (M4), Burkholderia cepacia2 (M5) and fungi phosphate solubilization are Penicillium sp. 1 TMS (M6), Talaromyces pinophilus (M7), Aspergillus terreus (M8), Aspergillus awamori (M9), Penicillium sp. (M10). The parameter of observations are total soil P analysis, soil P availability, nitrogen (N) uptake, phosphorus (P) uptake and potassium (K) uptake of plant in vegetative period and potato production. The data were subjected to analysis of variance (ANOVA) procedures the SAS version 12 computer programs and comparison of means were tested for significance using least significant difference (LSD ) p = 0.05. Results: The research results showed that microbial phosphate solubilization is able to increase the P availability at 2.47-71.08%, nutrient uptake at 1-89.4% and total production at 9.3-68%. Conclusion: It was concluded that best treatment in increasing the availability of P and the production of the potato plant is application of fungi phosphate solubilization, Talaromyces pinophilus treatment (M7).
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