Rina Devnita

Application of nanoparticle of rock phosphate and biofertilizer in increasing some soil chemical characteristics of variable charge soil

Soils in Indonesia are dominated by variable charge soils where the technology like fertilization did not give the same result as the soils with permanent charge. The objectives of this research is to increase some chemical characteristic of variable charge soils by using the high negative charge ameliorations like rock phosphate in nanoparticle combined with biofertilizer. The research used a complete randomized experimental design in factorial with two factors. The first factor was nanoparticle of rock phosphate consists of four doses on soil weight percentage (0%, 2.5%, 5.0% and 7.5%). The second factor was biofertilizer consisted of two doses (without biofertilizer and 1 g.kg−1 soil biofertilizer). The combination treatments replicated three times. Variable charge soil used was Andisol. Andisol and the treatments were incubated for 4 months. Soil samples were taken after one and four months during incubation period to be analyzed for P-retention, available P and potential P. The result showed that all combinations of rock phosphate and biofertilizer decreased the P-retention to 75-77% after one month. Independently, application of 7.5% of rock phosphate decreased P-retention to 87.22% after four months, increased available P (245.37 and 19.12 mg.kg−1) and potential P (1354.78 and 3000.99 mg/100) after one and four months. Independently, biofertilizer increased the P-retention to 91.66% after four months, decreased available P to 121.55 mg.kg−1 after one month but increased to 12.55 mg.kg−1 after four months, decreased potential P to 635.30 after one month but increased to 1810.40 mg.100 g−1 after four months.Soils in Indonesia are dominated by variable charge soils where the technology like fertilization did not give the same result as the soils with permanent charge. The objectives of this research is to increase some chemical characteristic of variable charge soils by using the high negative charge ameliorations like rock phosphate in nanoparticle combined with biofertilizer. The research used a complete randomized experimental design in factorial with two factors. The first factor was nanoparticle of rock phosphate consists of four doses on soil weight percentage (0%, 2.5%, 5.0% and 7.5%). The second factor was biofertilizer consisted of two doses (without biofertilizer and 1 g.kg−1 soil biofertilizer). The combination treatments replicated three times. Variable charge soil used was Andisol. Andisol and the treatments were incubated for 4 months. Soil samples were taken after one and four months during incubation period to be analyzed for P-retention, available P and potential P. The result showed that all...

P retention and cation exchange as affected by nanoparticle of volcanic ash and application of phosphate solubilizing bacteria on Andisol Ciater, West Java, Indonesia

Andisols is a soil with high retention of phosphate and cannot be absorbed by plants. Some of soil bacteria have the ability to solubilize P and make it available to growing plants are known phosphate solubilizing bacteria (PSB). The research aims to study the effect of nanoparticle volcanic ash and phosphate solubilising bacteria (PSB) on P retention and cation exchangeable (CEC) in Andisol Ciater, West Java. This research was conducted from October 2016 to March 2017. The design of the analysis used was a complete randomized factorial design with two factors. The first factor was nanoparticle volcanic ash (a) consists of four dosages based on weight percentage (0%, 2.5%, 5.0% and 7.5%) and the second factor was PSB (h) consists of two dosages (without biofertilizer and with biofertilizer 1 g/Kg soil). The combination treatments replicated three times were incubated for 4 months. Soil samples were analyzed at first month and fourth month after incubation. The results showed that all dosages of nanoparticle volcanic ash and application of PSB decreased P retention by 75-77% at the first month after incubation. Nanoparticle volcanic ash dosage decreased to 7.5% the P retention reaches 90.36% in the fourth month after incubation. The nanoparticle of volcanic ash dosage 7.5% increased with CEC (24.787 cmol.kg−1 and 16.555 cmol.kg−1) at the first and fourth months after incubation. The application of PSB increased the CEC (28.606 cmol.kg−1) in the first month after incubation.Andisols is a soil with high retention of phosphate and cannot be absorbed by plants. Some of soil bacteria have the ability to solubilize P and make it available to growing plants are known phosphate solubilizing bacteria (PSB). The research aims to study the effect of nanoparticle volcanic ash and phosphate solubilising bacteria (PSB) on P retention and cation exchangeable (CEC) in Andisol Ciater, West Java. This research was conducted from October 2016 to March 2017. The design of the analysis used was a complete randomized factorial design with two factors. The first factor was nanoparticle volcanic ash (a) consists of four dosages based on weight percentage (0%, 2.5%, 5.0% and 7.5%) and the second factor was PSB (h) consists of two dosages (without biofertilizer and with biofertilizer 1 g/Kg soil). The combination treatments replicated three times were incubated for 4 months. Soil samples were analyzed at first month and fourth month after incubation. The results showed that all dosages of nanopartic...

The phosphorus status of andisols as influenced by nanoparticles of volcanic ash and rock phosphate

Andisols need to be ameliorated to improve the phosphorus status. The objective of this research is to investigate the effect of nanoparticles of volcanic ash and rock phosphate as ameliorants in Andisols to P-retention, available P and potential P in Andisols. The research used a complete randomized experimental design in factorial with two factors. The first factor was nanoparticle of volcanic ash (a) and the second factor was rock phosphate (p). Both ameliorants consist of four doses on soil weight percentage (0%, 2.5%, 5.0% and 7.5%). The combined treatments were replicated three times. The soil and treatments were mixed and incubated for 4 months. Soil samples were taken after one month and four months of incubation to be analyzed the P-retention, available P and potential P. The results showed that there are interactions between the volcanic ash and rock phosphate on available P and potential P after one month of incubation. However, there were no interactions occurring between the volcanic ash and rock phosphate on P-retention after one and four months of incubation and no interactions on available P and potential P after four months. The best combined treatments in increasing available P and potential P after one month was obtained in 2.5% of volcanic ash and 5% of rock phosphate that increased available P to 405.75 ppm. The 2.5% of volcanic ash and 7.5% of rock phosphate increased potential P to 2190.26 mg/100 g. Independently, 7.5% of volcanic ash and rock phosphate decreased P-retention to 71.49% after one month and 89.74% after four months. Higher effect on the application of nanoparticle of volcanic ash and rock phosphate to the phosphorus status of Andisols recieved after one month of incubation is compared with four months of incubation.Andisols need to be ameliorated to improve the phosphorus status. The objective of this research is to investigate the effect of nanoparticles of volcanic ash and rock phosphate as ameliorants in Andisols to P-retention, available P and potential P in Andisols. The research used a complete randomized experimental design in factorial with two factors. The first factor was nanoparticle of volcanic ash (a) and the second factor was rock phosphate (p). Both ameliorants consist of four doses on soil weight percentage (0%, 2.5%, 5.0% and 7.5%). The combined treatments were replicated three times. The soil and treatments were mixed and incubated for 4 months. Soil samples were taken after one month and four months of incubation to be analyzed the P-retention, available P and potential P. The results showed that there are interactions between the volcanic ash and rock phosphate on available P and potential P after one month of incubation. However, there were no interactions occurring between the volcanic ash and ...

Remediation of Volcanic Ash Soil in Related to Soil Erodibility Against the Heavy Rainfall

Volcanic ash soil is a productive soil, but its P-retention has to be reduced to increase the available P. This research remedied the volcanic ash soil with steel slag and bokashi of husk to overcome the P-problem and to investigate their influence to soil physical aspects related to the soil erodibility. The treatments were arranged in randomized block designed in factorial pattern with two factors: steel slag and bokashi of husk, each consisted four levels: 0, 2.5, 5.0, and 7.5 % of soil weight (w/w), made the 4 × 4 or 16 combination treatments. The soil with each treatment was mixed thoroughly, filled into polybags, watered to the field capacity, closed tightly, incubated for four months, and sampled for chemical and physical analyses. The parameters were P-retention, available P, bulk density, organic carbon, permeability, and erodibility. Texture and structure was measured prior to the treatments to be calculated as erodibility factors. The results show that steel slag and bokashi of husk interact in increasing available P from 10.02 to 70.02 ppm. Steel slag and bokashi of husk do not interact in decreasing P-retention, decreasing bulk density and increasing permeability, but bokashi of husk individually shows the effect to such parameters. The soil erodibility is improved from 0.19 to 0.14. These results show that the remediation of volcanic ash soil to fix the P-status will also fix the soil erodibility against the heavy rainfall.

Isolation and Screening of Phosphate Solubilizing Bacteria from Rhizosphere of Tea (Camellia Sinensis L.) on Andisols

Article History Received: 23 August 2017 Revised: 17 January 2018 Accepted: 19 January 2018 Published: 22 January 2018