Orange-Fleshed Sweet Potato (OFSP) is an important crop in Indonesia. Yield potential and genotypic adaptability are important factors in varietal development. The purpose of this study was to estimate the stability of yield and to select the best OFSP genotypes across three agroecosystems in West Java, Indonesia. The field trials used were augmented design with 50 F1 Orange-Fleshed Sweet Potato (OFSP) genotypes as treatment, and seven check varieties as controls. The experiments were conducted in three different agroecosystems in West Java (Sumedang, Bandung, and Karawang). Selection was based on physical characteristics of sweet potato tuber, yield and stability across three environments. Data analysis of the yield characters, yield component, and tuber quality were performed by combined variance analysis. Selected genotypes were analyzed for stability yield using the parametric, non-parametric, Additive Main effects and Multiplicative Interaction (AMMI), AMMI Stability Value (ASV), and Genotype and Genotype by Environment (GGE) biplot models. Results identified the top best ten F1 genotypes namely F1-38 (G1), F1-69 (G2), F1-71 (G3), F1-77 (G4), F1-127 (G5), F1-128 (G6), F1-135 (G7), F1-159 (G8), F1-191 (G9), and F1-226 (G10). Location showed a significant effect on yield. Genotypes F1-069, F1-077, F1-226, F1-038, and F1-128 have the lowest ASR based on non-parametric and parametric stability models and there were identified as the most stable. AMMI analysis identified F1-128, F1-135, F1-038, and F1-069 as the most stable genotypes. F1-38 (G1), F1-69 (G2), F1-128 (G6) were found to be the most stable genotypes based on ASV analysis, while GGE biplot identified F1-38 (G1) and F1-69 (G2) genotypes as the stable genotypes. Other genotypes were considered to as location-specific. Based on AMMI, ASV, and GGE Biplot models, F1-038, and F1-069 were identified as stable genotypes. They produced higher yields than other genotypes. Therefore, the F1-038 and F1-069 genotypes can be potentially recommended as superior varieties for West Java, Indonesia.

Sari. Padi hitam memiliki khasiat yang baik untuk kesehatan, yang dapat meningkatkan daya tahan tubuh terhadap penyakit, mencegah gangguan fungsi ginjal, mencegah kanker / tumor, dan banyak manfaat lainnya. Dewasa ini, produktivitas padi hitam masih relatif rendah, dengan beberapa penyebabnya adalah degradasi lahan dan ketidakseimbangan nutrisi di tanah. Salah satu ordo tanah yang distribusi secara luas di Indonesia yang dapat digunakan untuk budidaya tanaman adalah Inceptisol. Oleh karena itu, Inceptisols memerlukan penanganan yang tepat, seperti aplikasi pupuk organik dan anorganik yang seimbang. Tujuan dari penelitian ini adalah untuk mengetahui macam pupuk organik dan dosis N, P, K terbaik terhadap pH tanah, P tersedia, serapan P dan bobot gabah kering panen dan gabah kering giling padi hitam (Oryza sativa L.). Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok (RAK) dengan 10 perlakuan, tiga ulangan. Jenis pupuk organik terdiri dari kompos jerami, pupuk kandang ayam, pupuk kandang sapi, dan pupuk kandang domba dengan dosis 10 t / ha. Pupuk N, P, K yang digunakan terdiri atas dosis 50% dan 100% rekomendasi (Urea 300 kg/ha; TSP 50 kg/ha; KCl 50 kg/ha). Hasil penelitian menunjukkan bahwa aplikasi pupuk kandang ayam + 100% N, P, K rekomendasi memberikan bobot gabah kering giling terbaik pada padi hitam (Oryza sativa L.) menghasilkan 55,40 g / tanaman atau 7,09 t/ ha..Kata kunci: Padi hitam ∙ Pupuk organik ∙ Pupuk N,P,K ∙ Inceptisol ∙ Fosfor Application of organic and N, P, K fertilizer to pH, P-available, P absorption, and black rice yield (Oryza sativa L.) in inceptisol ABSTRACT. Black rice has good advantages for health, which can increase the body's resistance to disease, prevent kidney failure, prevent cancer/tumors, and many other benefits. Today, the productivity of black rice is still relatively low, with several causes being land degradation and imbalance of nutrients in the land. One of the land orders that is widely distributed in Indonesia for plant cultivation is Inceptisols. Therefore, Inceptisols needed a proper handling, such as balanced application of organic and inorganic fertilizers. The aim of this research was to know the best type of organic fertilizer and the best dosage of N,P,K on soil pH, available P, P uptake and yield of black rice (Oryza sativa L.). The experimental design used Randomized Block Design (RBD) with 10 treatments and three replications. The type of organic fertilizer consisted of rice straw compost, chicken manure, cow manure, and sheep manure, with 10 t/ha doses. The N,P,K fertilizer that used has a dosage of 50% and 100% (Urea 300 kg/ha, TSP 50 kg/ha, and KCl 50 kg/ha). The results showed that the application of chicken manure + 100% N,P,K gave the best yield on black rice (Oryza sativa L.) yield of 55.40 g / plant or 7.09 t/haKeywords: Black rice ∙ Organic fertilizer ∙ N,P,K fertilizer ∙ Inceptisols ∙ Phosphorus

Rice is a food source of carbohydrate which is a staple food in Indonesia. One way to increase production is to control soil productivity by using organic and inorganic fertilizers. This research was conducted to determine the effect of organic fertilizer combined with N, P, K inorganic fertilizers on the chemical properties and growth of rice plants. This research was conducted from June-September 2018. The experimental design was carried out using a Randomized Block Design (RBD) consisting of 10 treatments with three replications. The treatment combination consisted of liquid organic fertilizer dosages of 0 ml / L, 2.5 ml / L, 5 ml / L 7.5 ml / L and 10 ml / L and inorganic fertilizer N doses of 0 kg / ha, 50 kg / ha, 100 kg / ha, 150 kg / ha 200 kg / ha. inorganic P 0 kg / ha, 37.5 kg / ha, 75 kg / ha, 112.5 kg / ha, 150 kg / ha inorganic K 0 kg / ha, 12.5 kg / ha, 25 kg / ha, 37.5 kg / ha 50 kg / ha. The results showed that the combination of organic and inorganic fertilizers N, P, K did not influence the soil chemical properties and plant growth. The highest yields on plant height after 8 WAP were shown in treatment D (1 dose of LOF + 1 N, P, K) with 58.03 cm.

Penelitian ini bertujuan untuk mengetahui pengaruh pemberian berbagai macam dosis Pupuk Kalium Hasil Inovasi (PKHI) terhadap peningkatan pertumbuhan dan hasil tanaman jagung manis pada jenis tanah inceptisol. Penelitian ini menggunakan rancangan acak kelompok pola sederhana dengan faktorial tunggal. Faktor perlakuan tunggal yang diujikan pada penelitian ini yaitu variasi dosis Pupuk Kalium Hasil Inovasi (PKHI) yang terdiri dari variasi dosis dan kontrol, yakniA(N,P Tunggal), B(N,P,K Tunggal), C(1/4 K + N,P Tunggal), D(1/2 K+ N,P Tunggal), E(3/4 K+ N,P Tunggal), F(1 K+ N,P Tunggal), G(1 1/4 K+ N,P Tunggal), H(1 1/2 K+ N,P Tunggal), I(1 3/4 K+ N,P Tunggal), dan J (Kontrol). Masing-masing perlakuan diulang tiga kali, sehingga jumlah seluruhnya didapat 30 plot percobaan. Hasil penelitian menunjukan bahwa pemberian Pupuk Kalium Hasil Inovasi (PKHI) memberikan pengaruh nyata terhadap pertumbuhan dan hasil meliputi tinggi tanaman, jumlah daun, bobot tongkol, diameter tongkol, dan panjang tongkol. Dosis Pupuk Kalium Hasil Inovasi (PKHI) paling memberikan pengaruh nyata terhadap pertumbuhan atau hasil yaitu pada dosis 1 1/2 K dengan 240 Kg/Ha Pupuk Kalium yang diuji dan menghasilkan 18 Ton tongkol per hektar.Kata kunci : Inovasi Pupuk Kalium, Jagung Manis, Hasil Pertanian

The Relationship between N, P, and K Uptake of Chili Plants to Their Residues in Soil Treated by Liquid Organic Fertilizers and NPKThis study aims to determine the relationship of N, P, and K uptake of chili plants towards the residues in the soil treated with liquid organic fertilizer with the addition of inorganic fertilizers of N, P and K. The research was conducted from September 2017 to January 2018 in the experimental field and KTNT Laboratory, Faculty of Agriculture, Universitas Padjadjaran. The design used was simple complete randomized design with 10 treatments and were repeated 3 times, with the treatment arrangement as follows: A = Control 0 PS + 0 NPK, B = 0 PCO + 1 NPK, C = 1 PCO + 0 NPK, D = 1 PCO + ¼ NPK, E = 1 PCO + ½ NPK, F = 1 PCO + ¾ NPK, G = 1 PCO + 1 NPK, H = ¼ PCO + ¾ NPK, I = ½ PCO + ¾ NPK and J = ¾ PCO + ¾ NPK. The results showed that the highest nutrient uptake and residue was found in the treatment of 1 PCO + ¾ NPK. Relationship between N, P and K uptake with nutrient residue on the soil was detected. The N, P and K residues were influenced by the N, P and K uptake of chili plants of 92%, 98%, and 97%, respectively.Keywords: Chili, NPK, Liquid Organic Fertilizer, Residue, AbsorptionABSTRAKPenelitian ini bertujuan untuk mengetahui hubungan serapan N, P, dan K tanaman cabai terhadap residunya di dalam tanah yang diberi pupuk cair organik dengan pupuk anorganik N, P dan K. Penelitian dilaksanakan pada bulan September 2017 sampai dengan Januari 2018 di kebun percobaan dan Laboratorium KTNT Fakultas Pertanian, Universitas Padjadjaran. Rancangan yang digunakan adalah RAK sederhana dengan 10 perlakuan yang diulang 3 kali dengan susunan perlakuan sebagai berikut: A = Kontrol 0 PS + 0 NPK, B = 0 PCO + 1 NPK, C = 1 PCO + 0 NPK, D = 1 PCO + ¼ NPK, E = 1 PCO + ½ NPK, F = 1 PCO + ¾ NPK, G= 1 PCO + 1 NPK, H = ¼ PCO + ¾ NPK, I = ½ CO + ¾ PK dan J = ¾ PCO + ¾ NPK. Hasil penelitian menunjukkan bahwa serapan dan residu hara tertinggi ialah perlakuan F = 1 PCO + ¾ NPK. Terdapat hubungan antara serapan N, P dan K dengan residu hara pada tanah. Residu N, P dan K dipengaruhi oleh serapan N, P dan K tanaman cabai masing-masing sebesar 92% serapan N, 98% serapan P, dan 97% serapan K.Kata Kunci: Cabai, NPK, PCO, Residu, Serapan

This study aimed to determine the effect of the application of liquid organic fertilizer (PCO) accompanied with Nitrogen-Phosphate-Pottasium (NPK) fertilizer towards the growth and yield of chili plants on Jatinangor Inceptisol. The study was conducted from September 2017 until January 2018 in the experimental field and

Inceptisol is a widespread soil order with low fertility. Hence it is necessary to improve its quality status through the application of chemical and biological fertilizers. The main objecttive of this study is to determine the effect of NPK fertilizer and biofertlizer consortia (BC) combinations in Inceptisols towards N and P availability in soil and uptake by soybean (Glycine max L.). Experiments were carried out from April to August 2016 at Ciparanje Experimental Farm, Faculty of Agriculture, Universitas Padjadjaran, Jatinangor, Sumedang at the approximate altitude of 720 meters above the sea level. Randomized Block Design experimental design consisted of ten treatments and three replications was used in this study. Treatments consisted of control (no treatment), Recommended NPK dosage, 0 NPK + 1 BC, ¼ NPK + 1 BC, ½ NPK + 1 BC, ¾ NPK + 1 BC, 1 NPK + 1 BC, ¾ NPK + ¼ BC, ¾ NPK + ½ BC and also ¾ NPK + ¾ BC. Experimental results showed that the combination of NPK fertilizer and soybean-spesific biofertilizer consortium increased soil total phosphate content,  nitrogen uptake by plant, and soyben yield significantly.  Keywords: Biofertilizer, Soybean, total-N, Uptake of N, Inceptisols

Environment is one important factors that must be considered in supporting sweet potato productivity. Environmental factors can be biotic and abiotic, including the availability of nutrients and microbes in the soil. This study aimed to identify the nutrient content of the soil in paddy fields and dry fields, identify the total invertase microorganisms in paddy fields and dry fields, and identify the relationship between soil nutrients and microorganisms during the growth of Cilembu sweet potato in dry and paddy fields agroecosystems. This research was conducted on dry fields and paddy fields in Cilembu Village, Sumedang Regency. The experimental design used was a randomized block design (RBD) with six treatments and three replications:  A; Rancing,  paddy fields, B; Biang, paddy fields, C; Mencrang, paddy fields, D; Rancing,  dry fields, E; Biang,  dry fields, F; Mencrang, dry fields. The observed parameters included pH, C-organic, total-N, available-P, exchangeable-K, exchangeable-Na, exchangeable-Ca, and exchangeable-Mg, cation exchange capacity (CEC), and total invertase-producing bacteria. The results showed that in paddy fields, the pH was slightly acidic, and the nutrient content such as N, available P, exchangeable Ca, Mg, Na, CEC, and C-organic tended to be more available. Soil K and abundant invertase bacteria were more available in the dry fields. The activity of invertase bacteria had a close relationship with the K content. The information generated in this study could be used to determine an effective location to produce good quality sweet potato.