Abstract
Phosphorous (P) contents in many soils are varies highly along with their ability to provide available P to plant growth. Soils may contain very high in total P, but low in available P due to high P adsorbed by soil matrix and all their adsorbing agents. This research which using natural materials was aimed to increase P availability in some high-P absorption soils. The natural materials utilized for extracting P were organic matter, P extracting bacterial, and rock phosphate. Those materials were interacted to high P absorption soils which were: Oxisol, Inceptisol, and Andisol. The detail objectives of this research were: (1) to study the potential of P-extracting agents (organic matter, and P-extracting bacteria) in releasing P of three high P- absorption soils; (2) to quantify the -age of P coming from the treatments; (3) to calculate the efficiency of P utilization by plant; and (4) to quantify Residual P in soils. The P mobility was analyzed by radioisotope technique using KH232PO4 carrier free solution. The results showed that adding soil organic matter increased the available P by 15.24% in Oxisol, 40.18 in Inceptisol, and by 7.34% in Andisol. Plant sorption toward P from % P used efficiency(%-PUE) up to 60 days was still very low, 0.65 to 9.34%. This was in accordance with the residual P in soils which were still quite high ranging from 94% to 96% in Andisol, 91%97% in Inceptisol, and 96%-98% in Oxisol. The implication of the results of this research, however, is that the application of natural materials in improving soil P availability provides a longtimeresidual effect which could give benefit to the following crops.Keywords: Andisols; Inceptisol; Oxisols; P. diminuta; PUE; rock phosphate[How to Cite: Mudjiharjati A, TC Setiawati and MH Pandutama. 2012. Improving Phosphate Efficiency by Phosphate Solubilizing Bacteria and Organic Matter Estimated by Radio Isotop (32P) Technique in Some Soils. J Trop Soils, 17 (3) : 245-252. doi: 10.5400/jts.2012.17.3.245][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.245]
Highlights
Manado City of North Sulawesi Province is known as a waving palm city that is characterized by the spread of palm plants
Pandin (2009) reported that North Sulawesi has collected various types of coconut based on the nature of the speed of the first flowering, leaf number, number of
ZE Tamod et al.: Diagnosing Soil and Coconut Root Existence is lower than the coconut that in a relatively can last up to 100 years
Summary
Manado City of North Sulawesi Province is known as a waving palm city that is characterized by the spread of palm plants. Pandin (2009) reported that North Sulawesi has collected various types of coconut based on the nature of the speed of the first flowering, leaf number, number ofJ Trop Soils, Vol 21, No 2, 2016: 99-108 ISSN 0852-257X bunches, levels of copra and oil content. Manado City of North Sulawesi Province is known as a waving palm city that is characterized by the spread of palm plants. Some types of coconut are known, among others, in Mapanget (DMT) and in Tenga (DTA), which produces more than 80 grains tree-1 yr-1. Runtunuwu et al (2008) assessed the hybrid coconut that has been through the assembly of hybrid seeds with a relatively uniform growth, the productive growth. ZE Tamod et al.: Diagnosing Soil and Coconut Root Existence is lower than the coconut that in a relatively can last up to 100 years. The coconut production can be increased by addition of nutrition in the form of chemical or organic fertilizers, the last is derived from organic matter to improve the growth of coconut through plant roots
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