Residue of Pesticides on Horticultural Crops (Case Study in Cihanjuang Rahayu Village, Parongpong District, West Bandung Regency)The purpose of this study was to investigate the type of residual concentrate of chlorpyrifos pesticides accumulated in horticultural crops, the impact of pesticide residues to the public health and daily intake assumption. This study used a quantitative approach to survey methods to know in depth about pesticide residues on horticultural crops where the data source consisted of primary data obtained from interviews and the results of chemical analysis and secondary data collected directly from some sources. In several types of insecticides used by farmers in Cihanjuang Rahayu village, there are kind of insecticides that did not recommended to control pests on broccoli. Based on the analysis of pesticide residues, residue results were obtained from four broccoli samples with 10%, 20%, 60% and 80% greater than the maximum residue limit. This suggests that the four samples tested contain harmful residues exceeding the maximum limit of 2 ppm residue. Health effects of pesticides on farmers included nausea, vomiting, dizziness and itching of the skin. The calculating results of intake assumption on the risk of health obtained the result of 1,505 g/day with the highest value of 4,014 g/day and the lowest risk was the amount of intake of 423 g/day. From the results of these calculations, it can be seen that the amount of consumption of vegetables and horticulture was having average risk to farmers as much as 1,505 g/day.Keywords: Residue, Pesticides, Horticulture, BroccoliABSTRAKTujuan penelitian ini yaitu untuk mengetahui jenis konsentrat residu pestisida klorpirifos yang terakumulasi pada tanaman hortikultura, dampak residu pestisida bagi masyarakat dan asumsi asupan beresiko kesehatan per hari. Penelitian menggunakan pendekatan metode survei bersifat kuantitatif dengan sumber data primer yang diperoleh dari hasil wawancara dan hasil analisis kimia serta data sekunder yang dikumpulkan secara langsung dari narasumber. Beberapa jenis insektisida yang digunakan oleh petani di Desa Cihanjuang Rahayu, Bandung Barat terdapat jenis insektisida yang tidak direkomendasikan untuk mengendalikan hama pada tanaman brokoli. Hasil analisis terhadap residu pestisida pada empat sampel tanaman brokoli diperoleh residu pada keempat sampel yang diuji dengan persentase 10%, 20%, 60% dan 82% dari batas maksimum residu. Dampak penggunaan pestisida terhadap kesehatan petani yaitu berupa mual-mual, muntah, pusing dan gatal-gatal pada kulit. Hasil perhitungan asumsi asupan beresiko kesehatan melalui analisis pemajanan diperoleh hasil 1.505 g/hari dengan nilai tertinggi 4.014 g/hari dan jumlah asupan beresiko terendah adalah 423 g/hari. Dari hasil perhitungan tersebut dapat diketahui bahwa jumlah konsumsi sayuran dan hortikultura rata-rata beresiko oleh para petani adalah sebesar 1.505 g/hari.Kata Kunci: Residu, Pestisida, Hortikultura, Brokoli

Analyse of soil chemical properties in the encriment of oil palm production on sandy soil at Selangkun oli palm plantationSoil is one of basic components in the development of oil palm plantation. Limitation of land causes many companies expand their areas to the sub-optimal land, such as sandy soil. This research was aimed to analyzed chemical soil properties and its relation with bunch number and bunch weight in oil palm plantation, Arut Selatan sub-district, Central Kalimantan. Survey was made in sample points that were determined based on grid system, and each sample was taken in the depth of 30 cm. This research was descriptive and used double regression equation with backward-stepwise method. Several parameters have been analyzed, such as pH, organic carbon, CEC, total N, total P, P-availability, K, Ca, Mg, Cu, Zn, Mn, and B. The result showed that the pH was categorized acid, macro nutrients were medium to very low, except total P and P-availability, while micro nutrients were enough, except boron which had very high amount. Furthermore, statistical analysis showed that some chemical properties, such as total N, CEC, and exchangeable Al were parameters which influenced production of bunch number per oil palm plant.Keywords: Oil palm, Soil nutrient, Sandy soilABSTRAKTanah merupakan salah satu komponen dasar dalam pembangunan perkebunan kelapa sawit. Keterbatasan lahan menyebabkan banyaknya perusahaan yang memperluas areal perkebunan ke lahan sub-optimal, seperti tanah pasir. Penelitian ini bertujuan mengkaji sifat-sifat kimia yang ada pada tanah pasir dan hubungannya dengan produksi tandan per pohon dan berat tandan rata-rata tanaman kelapa sawit di kecamatan Arut Selatan, Kalimantan Tengah. Survei dilakukan pada titik sampel didasarkan pada metode grid, dan sampel diambil pada kedalaman 30 cm. Penelitian ini merupakan penelitian deskriptif dan menggunakan model persamaan regresi berganda metode backward-stepwise. Beberapa parameter yang dianalisis adalah pH, C-organik, KTK, N-total, P-total, P-tersedia, K, Ca, Mg, Cu, Zn, Mn, dan B. Hasil analisis menunjukkan bahwa pH tanah tergolong rendah, kandungan hara makro berkisar sedang sampai sangat rendah, kecuali P-total dan P-tersedia, sementara kandungan hara mikronya cukup, kecuali boron yang tergolong tinggi. Sifat kimia tanah seperti N-total, KTK, dan Al-dd merupakan parameter yang meningkatkan jumlah tandan per pohon.Kata Kunci: Kelapa sawit, Hara tanah, Tanah pasir

Constraint of peat land utilization is low nutrent content. This research was conducted to determine the potency of phosphate solubilizing microbes (PSM) in solubilizing P yto increase the growth and P uptake of plant in peat soil. Based on their ribosomal DNA the best PSM were identified as Burkholderia gladioli nd Penicillium aculeatum that yield the highesr growth aphosphate uptake of oil palm seedling.

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Biofertilizer is a biological product that can be used to improve the soil fertility. It is useful in enriching soil with micro-organisms that produces organic nutrients and may also reduce the plant diseases. This experiment investigates the usefulness of biofertilizer which can increase the soil properties. This study was conducted at sugarcane plantation, Purwadadi Subang Bandung. The experiment was arranged in a Randomized Block Design (RBD) with 6 treatments and 4 replications. The treatments were (50; 25) g/treatment Biofertilizer + (¼; ½; ¾; 1) of the recommended dose of NPK and the recommended dose of NPK as a control. The chemical properties (potential K, K sorption, potential P, P sorption, total N and pH) were affected by biofertilizer application, except for N sorption. The best treatment from this product was combination from high level of biofertilizer (50 g) and (1/2 -1) of the recommended dose of NPK. The application of biofertilizer can substitute NPK fertilizer 25%-50% in soil. In general, this product has a good potency especially to increase some of soil chemical properties in a short time with simple application in the field.

The use of organic materials and minerals as fertilizer needs to be developed in order to increase agricultural productivity, especially in soils marginal that are widely distributed on the Indonesian. This study aims to determine the productivity of soil and corn plants by using various formulations of organo-mineral materials in the Ultisols Jatinangor. The experiment was conducted from April to November 2017 at Ciparanje Experimental Garden, Faculty of Agriculture, Universitas Padjadjaran, using a simple randomized block design consisting of 10 treatments and replicated 3 times. The organo-mineral ingredients used consist of a combination of Humic Acid (6; 8; 10 kg/ha); Dolomites (100; 150; 200 kg/ha); Natural Phosphates (250; 300; 350 kg/ha); also Zeolites (150; 200; 250 kg/ha). The results showed that ameliorant combination had significant effects on soil pH, P-available, and Mn Total, also the yield of maize. Dosage of 8 kg/ha of Humid Acids + 200 kg/ha of Dolomites + 350 kg/ha of Natural Phosphates + 250 kg/ha Zeolite, has indicated better result based on variable experiment.Keywords: maize, organo-mineral, Humic acid, dolomite, phosphate, ultisols

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