This study was conducted to evaluate the effect of organic fertilizer (i.e. cow manure) and inorganic fertilizer application on nutrient uptake and yield of sweet corn (Zea mays saccharata Sturt). Inceptisols possesses low soil fertility and relatively low to moderate level of organic matter content. Application of organic fertilizer in combination with inorganic fertilizers is expected to increase N, P and K uptake and yield of sweet corn. This study has been conducted from October 2018 to February 2019 at the Field Experiment of Agriculture Faculty, Universitas Padjadjaran, Jatinangor, West Java. The study was performed in a Randomized Block Design consisting of 10 treatments and 3 replications. The treatments were as follow: A = Control, B = Standard NPK, C = 0 NPK + 1 organic fertilizer, D = ¼ NPK + 1 organic fertilizer, E = ½ NPK + 1 organic fertilizer, F = ¾ NPK + 1 organic fertilizer, G = 1 NPK + 1 organic fertilizer, H = ¾ NPK + ¼ organic fertilizer, I = ¾ NPK + ½ organic fertilizer and J = ¾ NPK + ¾ organic fertilizer. The results showed that the treatment I (¾ NPK + ½ organic fertilizer) resulted the highest N, P and K uptake, i.e. 52.11 mg plant−1; 80.85 mg plant−1 and 54.17 mg plant−1, respectively and the heaviest weight of sweet corn of 400.15 g.

Essential nutrient needs for the growth of sweet corn can be fulfilled by the fertilization process. The combination of NPK+Mg fertilizer is one of the options to obtain adequate nutrient availability and increase sweet corn yield. This research aimed to determine the effect of NPK+Mg fertilizer on potassium availability, potassium uptake, and yield of sweet corn (Zea mays saccharata Sturt) Talenta variety in Inceptisols Jatinangor. This experiment was conducted at research field of Soil Fertility and Plant Nutrition, Department of Soil Science and Land Resources, Faculty of Agriculture, Universitas Padjadjaran from May to August 2019. The experimental design that had been used in this research was Randomized Block Design (RDB), which consisted 6 treatments of 1 control treatment, 1 standard NPK fertilizer treatment, and 4 treatments of NPK 12:12:17+9 MgO in different dosage. Each treatment was repeated four times so that there were 24 experimental plots. The results showed that the combination of NPK+Mg fertilization gave significant effect to the potassium availability, potassium uptake, and yield of sweet corn. 1 dosage of NPK+Mg fertilization (250 kg ha-1) gave the best effect on increasing potassium availability of 2,25 cmol kg-1 , potassium uptake of 1,50%, and the yield of sweet corn of 8,68 ton hectare-1 in Inceptisols Jatinangor.

Large P fixation on Andisols can be overcome by adding P fertilizer into soil. However, to support good plant growth required the provision of nutrients N, K, micro nutrients and hormones. Research objective was to find out effect of NPK fertilizer with liquid organic fertilizer on total bacteria and fungi in the rhizosphere and plant yield of chinesse cabage (Brassica pekinensis L.) grown in Andisols. Experiment was conducted from March until May 2011 at experimental field of PT. Multiguna Indah Lestari, Kayu Ambon village, Lembang subdistrict, Bandung regency, West Java, with altitude of 1000 m above sea levels. The experimental design was Randomized Block Design with nine treatments and three replications which consisting of combination. The fertilizer rates were without treatment (A), 1dose of NPK (B), 1 dose of liquid organic fertilizer (C), 1 dose of NPK + ½ dose of liquid organic fertilizer (D), 1 dose of NPK + ½ dose of liquid organic fertilizer (E), ½ dose of NPK + 1 dose of liquid organic fertilizer (F), ½ dose of NPK + 1 dose of liquid organic fertilizer (G), 1 dose of NPK + 1 dose of liquid organic fertilizer (H), 1 dose of NPK + 1 ½ dose of liquid organic fertilizer (I). The results showed that NPK fertilizers and liquid organic fertilizer influenced total bacterial as well as fungi in the rhizosphere and plant yield of chinesse cabage. Fertilization treatments that demonstrated the best effect on both microbial population and chinese cabbage yield was application of ½ recommended dose of NPK with 1 recomended dose of liquid organic fertilizer gives the best result of 54,72 kg per plot (54,18 ton ha-1).

Sweetcorn has been treated by cow manure and inorganic fertilizer in Inceptisols. Inceptisols possesses low soil fertility and a relatively low to moderate level of organic matter content. This study has been conducted from June to December 2018 at the Field Experimental Station of Agriculture Faculty, Universitas Padjadjaran, Jatinangor, West Java. The treatments are as follow: A = Control, B = Standard NPK, C = 0 NPK + 1 cow manure, D = ¼ NPK + 1 cow manure, E = ½ NPK + 1 cow manure, F = ¾ NPK + 1 cow manure, G = 1 NPK + 1 cow manure, H = ¾ NPK + ¼ cow manure, I = ¾ NPK +½ cow manure and J = ¾ NPK + ¾ cow manure. The combination of cow manure and inorganic performed the best result.

The Inceptisols have the potential to be developed into rice cultivation land because it is widely distributed in Indonesia but it has a low of soil fertility. Fertilization of N, P, K and Nano Silica fertilizers are efforts to provide nutrients for rice plants. Black rice that functional cultivated is Bangir Lokal Cianjur Variety. This study aims to determine the effect of N, P, K and Nano Silica fertilizes on total N content, N uptake, and Black Rice Yield (Oryza sativa L. indica) on Inceptisols. This research was conducted in November 2020 until March 2021 at the Soil Chemistry and Plant Nutrition Experimental Field, Faculty of Agriculture, Universitas Padjadjaran. Jatinangor with altitude 723 m asl. The experimental design was carried out using a RBD consisting of eight treatments and four replications. The treatments consisted of control ( without fertilizers); 1 N, P, K (Urea 300 kg/ha, SP-36 50kg/ha, and KCl 50 kg/ha);1 N, P ,K + 1 Nano Silica (2 mL/L); 1 N, P, K + 1,5 Nano Silica (3 mL/L); 1 N, P ,K + 2 Nano Silica (4 mL/L); ¾ N, P, K (Urea 225 kg/ha, SP-36 37,5kg/ha, and KCl 37,5 kg/ha) + 1 Nano Silica; ¾ N, P, K + 1,5 Nano Silica; ¾ N, P, K + 2 Nano Silca. The result showed that the combination of fertilizers doses of 1 N, P, K and 1 Nano Silica gives the best black rice yield with Dry Grain weight of 77,8 g/clump of rice