Intensive agricultural cultivation on Cilembu’s Inceptisols has become several soil properties problem for crop production. Nanoparticle phosphate rock and phosphate solubilizing fungi have ability to increase some soil properties content. The research aimed to observe the effect of nanoparticle phosphate rock and phosphate solubilizing fungi on soil P-potential, P-retention, C-organic and base saturation on Cilembu’s Inceptisols. The experiment arranged in Completely Randomized Design. The nanoparticle phosphate rock consisted of 4 levels. The phosphate solubilizing fungi consisted of 2 levels, and 2 replication. Soil P-Potential, P-Retention, C-organic, and Base Saturation were observed. The factors was observed after one month incubation on soil. Results showed that there were an interaction between nanoparticle phosphate rock and phosphate solubilizing fungi on the C-organic after one month incubation. Nanoparticle phosphate rock had affected on C-organic, P-potential and base saturation significantly, but had not affected on P-retention. Utilization of phosphate solubilizing fungi as soil ameliorant had affected significantly on P-potential and C-organic, but had not affected on P-retention and base saturation. Nanoparticle phosphate rock with a dose of 6% had the best effect on increase P-potential and base saturation

Cilembu's Inceptisols have great potential for agriculture. However, land management has several limiting factors: the available phosphate content, cation exchange capacity (CEC), and low population of functional soil organisms. Rock phosphate is a natural material that can increase the availability of P nutrient. Application of rock phosphate as an ameliorant in nanoparticle size and inoculation of phosphate-solubilizing fungi (PSF) is a strategy that can be implemented to address the Inceptisols constraints. However, the dynamic of chemical and biological characteristics of Cilembu Inceptisols due to amendment of phosphate rock nanoparticle (PRNp) and phosphate solubilizing fungi (PSF) inoculation is not yet understood clearly. To know the dynamics of the chemical and biological properties of the soil due to the treatment of these materials is an essential aspect for strategy and planning in its proper application to improve the properties of Inceptisols. The completely randomized design (CRD) was used in this study, with a factorial pattern, consisting of the first factor being the amendment of rock phosphate nanoparticle and the second factor being the PSF inoculation. The observation was carried out in a month interval, with a three-month incubation. The result showed there was no interaction between phosphate rock nanoparticle amendment and PSF inoculation on pH-H2O, available P, CEC, and abundance of PSF population. The independent effect showed that a characteristic pattern of pH and available P values during two months of observation was increasing by PRNp amendment. Meanwhile, inoculation of PSF did not increase soil pH and P-available. The value of CEC and the population of PSF did not increase significantly during the three-month incubation. The dose of phosphate rock nanoparticle 2% (wt/wt) increased the highest available P.

Gibberellin are hormones that accelerate the germination of seeds, buds sprout, stem elongation, leaf growth, stimulate flowering, fruit development, affecting root growth and differentiation. The research aims to determine the response kailan plants (Brassica oleraceae L.) against immersion PGR gibberellin (GA3) with various types growing media have been conducted in Ciparanje Jatinangor since March 2015 to May 2015. Using a randomized block design (RAK) factorial design with three replications consisting of two factors. The first factor is the provision of PGR gibberellin (GA3) which consists of: (1) 0 ppm (2) 25 ppm (3) 50 ppm (4) 75 ppm (5) 100 ppm. The second factor is the type of growing media consisting of: (1) land (2) husk (3) cocopeat, with observation parameters plant height, leaf number, fresh plant weight, dry plant weight and dashed root. The results showed that the use of PGR gibberellin (GA3) with a concentration of (g2) 50 ppm and the type of soil planting medium (m1) of the most influential in improving growth and yield of kailan plant.

Inceptisols Cilembu memiliki potensi besar untuk pertanian khususnya untuk budidaya ubi jalar Cilembu. Rendahnya kandungan P-tersedia yang merupakan unsur hara esensial berdampak pada produktivitas tanah. Aplikasi amelioran partikel nano batuan fosfat dan Jamur Pelarut Fosfat (JPF) memiliki kemampuan dalam meningkatkan P-tersedia Inceptisols Cilembu. Penelitian ini bertujuan untuk mengkaji pengaruh amelioran partikel nano batuan fosfat dan JPF terhadap beberapa sifat kimia Inceptisols di sekitar Cilembu. Metode penelitian menggunakan Rancangan Acak Lengkap Faktorial. Faktor pertama yaitu amelioran partikel nano batuan fosfat yang terdiri atas empat taraf, yaitu b0 = 0% (0 g), b1 = 2% (20 g kg -1 tanah), b2 = 4% (40 g kg -1 tanah), dan b3 = 6% (60 g kg -1 tanah). Faktor kedua yaitu JPF yang terdiri atas dua taraf, yaitu h0 = (0 g) dan h1 = JPF (10 g per kg -1 tanah). Parameter yang diamati: pH, P-tersedia, Kapasitas Tukar Kation (KTK), dan populasi JPF. Data hasil pengamatan dianalisis menggunakan analisis varians pada taraf 5%, dilanjutkan dengan uji beda jarak Duncan pada taraf 5%. Hasil analisis varians menunjukkan tidak terdapat interaksi antara amelioran partikel nano batuan fosfat dan JPF terhadap parameter yang diamati. Aplikasi amelioran partikel nano batuan fosfat berpengaruh nyata dalam meningkatkan pH dan P-tersedia. Penggunaan JPF berpengaruh nyata meningkatkan nilai KTK.