Land Suitable Areas Refer to Red Potato Planted on Medium Altitude in Rejang Lebong Bengkulu Province Indonesia

The research aims to define potential areas for red potato cultivation in agriculture land in Rejang Lebong District, Bengkulu Province, Indonesia. The research was conducted from February to April, 2016 in Rejang Lebong, geographically lying on 102°19'-102°57' Lat., 2°22'07''- 3°31' Long., covering of 155,504.81 ha. Land functions on the district are covered by of Bukit Daun and Bukit Balai Rejang protected forests, Kerinci Seblat National Park, Bukit Kaba Tourism Natural Forest Park, and agricultural cultivation areas. To define land suitability for red potato cultivation in Rejang Lebong areas based on suitable temperature following adaptation experiment results of red potato planted in the medium altitude of Bengkulu Province conducting previously. Spatial analysis for calculating areas of potential suitable cultivation for red potato was based on overlaying from attributes of suitable temperature, rainfall, and some soil characteristics.  Initial suitable land for potato plantation in Rejang Lebong covered about ha 46,608.98 ha or 29.97 % of the district area with agriculture land function of 11,954.59 ha or 7.69% of the district, and forest land use of 34,654.39 ha or 22.28% of the district.  Based on the overlying suitable land for red potato cultivation over the Rejang Lebong areas was about 108,639.36 ha lying on agriculture land use of 58,076.64 ha or 37.34%, and over on conservation and protected forest of 50,562.72 ha or 32.51%.  Potential suitable land for potato cultivation in Rejang Lebong after correcting with reference of suitable temperature covered double more of the agriculture land than that of the initial.  Therefore, in one hand, Rejang Lebong as a central of potato production in Bengkulu has some opportunities to increase potato production for supplying potato demand from surrounding areas in the future. On the other, attempt to increase potato production in Rejang Lebong have to consider environmental aspects and protected conservation forest areas

Numerical Study of Mixed Convection in A Cooled Room

The present work is carried out to study laminar mixed convection heat transfer inside a rectangular cooled room numerically. The chosen model is considered as a representation of a room facing the sun with a floor releasing heat resulted by electronic components or human activities. The Reynolds number and Richardson number are varied from 100 to 400 and 0 to 3, respectively, in order to cover laminar mixed convection phenomena. For the considered range of Re dan Ri, the flow regimes fall into  three modes. The higher Nusselt numbers are found at the higher values of Re, on the other hand, the forced convection leads to higher heat transfer rate than the free/natural convection

Growth and Yield of Soybean (Glycine max L. Merill) at Various Doses of Bokashi Fertilizer on Ultisol

Soybean is a type of secondary crop that is widely cultivated and used as raw material for tofu, tempe, milk, and so on by the people of Indonesia. Soybean consumption is always increasing but soybean production has decreased. This study aims to obtain the optimum dose of Bokashi fertilizer on plant growth and yield in Ultisol. The study was carried out in Medan Baru, Kandang Limun Village, Muara Bangkahulu District, Bengkulu City from December 2018 to April 2019. This study used a Completely Randomized Block Design (RCBD) with one factor, namely the dose of Bokashi fertilizer with five levels, namely 0 tons ha-1, 25 tons ha-1, 35 tons ha-1, 45 tons ha-1, and 55 tons ha-1. The results showed that the optimum dose of Bokashi fertilizer was not found in the growth component or yield component. The dose of Bokashi fertilizer had a significant effect (p<0.05) on the growth of Bokashi and the number of leaves

Land Suitability Evaluation for New Paddy Rice Field in Mukomuko District

This study aims to identify the physical, chemical characteristics of the soil and determine the suitability of rice fields for new openings in Mukomuko. This research was conducted from September to October 2019, which consisted of fieldwork and laboratory analysis. This research uses a survey method, soil sampling is carried out by a composite method consisting of 5 soil samples. Composite soil sampling technique based on land unit work maps produced from the map of soil types Mukomuko district scale of 1: 100.000. The results showed that all samples had the same dominant limiting factors namely P2O5, K2O, and Base Saturation. Land suitability for lowland rice plants in Mukomuko District Af.1.2.1 (S3nr) land area with an area of 42.68 ha, Af.1.2.2 (S3nr) land area with an area of 56.65 ha, land unit Tf.2.1 (S3nr) with an area of 60.15 ha, and land unit Tf.3.1 (S3nr) with an area of 89.30 ha.

Enhancing Entisols Physical Properties and Sweet Corn Agronomic Performances with Liquid Organic Fertilizer and Cow Manure

Entisols, comprising approximately 10.6% of Indonesia's land area, are youthful soils distinguished by sandy texture, loose structure, ample aeration porosity, rapid permeability, low water retention, and diminished organic matter. This study determines the optimal dosages of liquid organic fertilizer and cow manure capable of enhancing the physical attributes of Entisols and the growth and yield of sweet corn plants. Employing a Randomized Complete Block Design (RCBD) with two factors, the research evaluates three doses of cow manure (0 tons ha-1, 5 tons ha-1, and 10 tons ha-1) and four concentrations of liquid organic fertilizer (0 mL L-1, 100 mL L-1, 200 mL L-1, and 300 mL L-1). The findings reveal that liquid organic fertilizer significantly influenced soil wet weight and pF pressure at 0.1 atm (12.68 g-1). Application of cow manure demonstrates tangible improvements in Entisols properties, with water content at 12.15%, bulk density at 0.73 g m-3, permeability at 90.57 cm hour-1, and soil wet weight and pF pressure at 0.1 atm (15.10 g). Furthermore, liquid organic fertilizer contributes to a plant height of 176.82 cm and husk cob weight of 8,545 kg ha-1, while cow manure results in a plant height of 174.05 cm and husk cob weight of 8.044 kg ha-1. The optimal combination emerged with a 300 mL L-1 concentration of liquid organic fertilizer or a 10 tons ha-1 dose of cow manure,  showcasing superior enhancements in Entisols' physical properties, as well as sweet corn plant growth and yield

The effect of humic acid on biological properties of soil and upland rice plants in entisol Coastal Bengkulu City

Entisol is a type of soil on coastal land that has low soil fertility, low soil aggregation, low organic matter content, low soil microorganism activity and high salt content that can affect growth and development of crop yields. Application of humic acid is expected to increase the fertility of the entisol soil. This study aims to measure the effect of humic acid application on soil biological properties and yields of upland rice in Entisol Pesisir, Bengkulu city. The research was carried out in July-November 2020 in the Beringin Raya Village, Muara Bangkahulu District, Bengkulu City. The research design used a two-factor Completely Randomized Block Design with four replications, arranged in a factorial manner in experimental units. The first factor is humic acid which consists of not given humic acid, and given humic acid. The second factor is upland rice varieties consisting of Inpago 10, Merah rice, and Putih rice. The results showed that the application of humic acid was able to increase the biological activity of the soil including the total microbial population of 68.73% and the percentage of root colonization reaching 23.65% and increasing the pH, and rice yields per plot reached 14.2%. Inpago variety has better adaptability than local varieties (Merah and Putih) which is indicated by soil biological activity such as total microbial population reaching 570.16 x 106 CFU g-1 with root colonization percentage reaching 88.75%, pH, and upland rice yield per plot was 2033.68 g/plot. So based on the results of the study, it is recommended to cultivate Inpago 10 varieties compamerah to local varieties

Cucumber (Cucumis sativus L.) Growth and Yield as Respons by Dolomite and Potassium Application on Peat Soil

This study aimed to determine the appropriate dose of dolomite, dose of K fertilizer, and the interaction of the treatments on the growth and yield of cucumber on peat soil soil. This research was conducted in Medan Baru, Muara Bangka Hulu Sub-district, Bengkulu City at an altitude of ± 10 meters above sea levelfrom September to December 2021. The experiment method used was a factorial Randomized Complete Block Design (RCBD) consisting of two factors; first, dose of dolomite with 3 levels consisting of 0.00 tons ha-1, 1.25 tons ha-1, and 2.5 tons ha-1 Dolomite, and the second, dose of potassium fertilizer consisting of 4 levels; 0 kg ha-1, 200 kg ha-1, 400 kg ha-1, and 600 kg ha-1 with 3 replications. Each unit of the experiment pot was planted with 3 plants therefore whole samples were obtained 108 experimental plant units (polybags). Cucumber growth and yield significantly responded to the dolomite and potassium application. The interaction between the dolomite and the potassium applied significantly to the cucumber planted shown by plant length, the diameter, and length of the fruit.

PRELIMINARY YIELD TEST OF HYBRID CORN ON ULTISOL UNDER LOW INPUT

Produktifitas jagung di lahan Ultisol sangat rendah. Pengapuran, pemberian bahan organik dan pemupukan dosis tinggi terutama fosfor untuk meningkatkan produktifitas jagung di lahan Ultisol merupakan upaya yang mahal, tidak ekonomis dan bersifat sementara. Varietas unggul jagung hibrida dirakit untuk kondisi lingkungan dan budidaya yang optimal, sehingga varietas hibrida menunjukkan produktifitas yang rendah jika ditanam pada lahan Ultisol. Tujuan penelitian ini adalah untuk menguji daya hasil pendahuluan (UDHP) lima varietas jagung hibrida di lahan Ultisol. Penelitian dilakukan di desa Pondok Kelapa, Bengkulu Utara mulai Maret hingga November 2009 menggunakan Rancangan Acak Kelompok Lengkap, tiga ulangan. Dua varietas jagung hibrida komersial Prima-1 dan DK-3 disertakan sebagai pembanding. Analisis varians untuk menguji signifikansi hibrida, dilanjutkan dengan Duncan Multiple Range Test (DMRT) 5%. Hasil penelitian menunjukkan bahwa hasil biji jagung pipilan kering tertinggi (5,07 ton ha-1) ditunjukkan oleh hibrida hasil persilangan G1xG4 dan nyata lebih tinggi dengan varietas hibrida pembanding Prima-1 dan DK-3 dengan hasil masing-masing 3,7 dan 4,41 ton ha-1. Hibrida hasil persilangan G1xG4 menunjukkan penutupan kelobot agak longgar di ujung tongkol. Penampilan sebagian besar ciri yang dikaji masih banyak dipengaruhi oleh faktor lingkungan seperti perbedaan kemiringan lahan. Ciri jumlah baris biji per tongkol dan penutupan kelobot (husk cover) menunjukkan heritabilitas sedang