Abstract:This trial was aimed to evaluate the performance of sweet potato cultivars on biochar application. The treatments were carried out using a Split-plot Design with three replications. The cultivars were placed on main plots and biochar doses were on sub-plots. The thirteen cultivars consisted of seven varieties and six accessions from Tribhuwana Tunggadewi University and Brawijaya University collections. The applied biochar doses were B 0 (0 t/ha) and B 1 (5 t/ha). The experimental unit measuring of 5 m x 0.6 m consisted of single row and planted with a spacing of 25 cm in row or 20 cuttings/row. The storage root weight, % dry matter, storage root dry weight, dry weight of biomass, harvest index and yield estimation were determined. The results showed that the sweet potato cultivars gave a significant response to the biochar application on fresh storage root weight, storage root dry weight, biomass dry weight, harvest index and storage root yields, but no interaction between cultivars and biochar doses. Storage root yield ranged from 8 to 21 t/ha without biochar and from 10 to 23 t/ha with 5 t biochar /ha, except for Beta 1 and Boko. The use of 5 t biochar /ha increased storage root yields that ranged from 8 to 45%. Keywords: biochar from tobacco industry waste, sweet potato, storage root fresh weightTo cite this article: Indawan, E., Lestari, S.U. and Thiasari, N. 2018. Sweet potato response to biochar application on sub-optimal dry land.
Sweet potato is a dual-purpose crop, which could produce both food and feed. The vine pruning prior to storage root harvesting was intended to increase the quantity and quality of fresh forage for animal feed. This study aims to evaluate whether periodic pruning can affect the storage root yield and its starch content. This experiment employed split-plot design with two factors and three replications. The first factor as main plot was vine pruning which consisted of four distinct pruning times (four times, three times, twice and once). The second factor as sub-plot was cultivars which consisted of six dual-purpose cultivars and two controls. The storage root yields, vine yields, starch yields and the reduction in storage root yields were observed. The results showed that the vine pruning decreased the storage root yields, with small increases the vine yields. The percentage of the reduction in storage root yields were 4-58%, while the decrease vine yields are relatively inconsistent. The starch yield of the cultivars with one pruning time were in the range of 2.34-6.67 ton ha<sup>-1</sup>. On the contrary, the three times pruning or more since 80 days after transplanted can reduce the starch yields for more than 50%. The slight increase in vines yield due to pruning was followed by the decrease in storage root yields and starch content of the sweet potato.
Abstract:The occurrence of pollution in mangrove land is due to changes in physical, chemical and biological properties of water because of the increasing human activities that produce problems due to residential and industrial wastes and other related activities, or due to seawater tide. The existence and presence of residential and industrial wastes in soil sediments can disturb the environment that in turn will threaten mangroves growth. This study was aimed to reveal the presence of heavy metals in sediment shown by environmental changes of water polluted by residential and industrial wastes. The study was conducted in field plots located at five watershed areas of Andil, Porangan, Kacar, Gombal and Krondo in Tambak Lekok Village of Pasuruan District, East Java. Field exploration and observation was started from waterfront and riverside vegetations. The exploration was made 300 m toward inland, perpendicular to the edge of the waters. The sediment samples of mangrove stands were collected at three points for each plot. The thickness of the collected sediment samples was ± 10 cm from the surface. Sediment samples were analyzed for heavy metals (Pb, Cr, Zn and Cu) and texture. The results showed that the Pb severely polluted the Gombal watershed with a concentration of 7.24mg/kg. The lowest Pb concentration of 7.24 mg/kg was observed for Andil watershed. Except for Andil watershed, Cu heavily polluted all the watersheds studied.
The study was aimed to gasp inventory an expired plant mangrove species characteristic respectively collection specimen land us function BTEX and heavy metal at growth environment. The study held from April through November 2007. Design with two classes, Rank I : survey activities and explored in land for quantity and identification, Rank II : Analysis totality solid matter petroleum level BTEX and heavy metal situ by research in location. The results of mangrove identification (main component, supporting component, and associated mangrove) showed there are 11 families and 25 species. BTEX parameter from soil sample was detected benzene intensive contamination on Andil river (16.30 ppm), Porangan river (81.30 ppm), Gombal river (56.90 ppm), Kacar river (36.90 ppm) but it was not detected on Krondo river. Toluene intensive contamination Porangan river (824 ppm) and Kacar river (896 ppm). BTEX parameter from water sample was detected benzene intensive contamination on Andil river (24.30 ppm), Porangan river (8.13 ppm), Gombal river (20.30 ppm), Kacar river (8.13 ppm), Krondo river (8.13 ppm), and Toluene contaminate slightly. Ethylbenzene and xilene were not detected by gas chromatography. Soil medium showed that contamination mainly Pb on Gombal river (5.98 mg/Kg), Kacar river (7.24 mg/Kg) and Krondo river (6.43 mg/Kg), where are Andil river and Porangan river were only slightly contaminated. The metal occurred on Cu for all, except Andil river (6.22 mg/Kg), whereas Zn and Cr did not contaminate, while Ag and Cd were not detected. Water medium was not contaminated by Pb, Cd, Cr, and Zn, furthermore Ag and Cu were not detected.
The experiment was conducted to evaluate the effect of different pruning intervals on nutrient composition and yield of vines from seven sweet potato cultivars. Treatments were arranged in a split-plot design with three replications. The pruning intervals were 80, 90, 120, and 150 days after planting as the main-plots and the trimming volume of sweet potato vine was 25%. Seven sweet potato cultivars (Kuningan Putih, Beta 2, Kuningan Merah, BIS OP-61, 73 OP-5, BIS OP-61-♀-29 and BIS OP-61-OP-22) were in the sub-plots and allocated at random. Results showed that increasing the pruning intervals increased dry matter, organic matter, and crude fiber significantly. However, ash and crude protein were decreased as the trimming intervals increased. Eter Extract was unaffected by trimming intervals.
Defoliation of the leaves of sweet potato plants needs to be done to reduce the rate of vegetative growth, because the rate of vegetative growth that is not balanced with generative growth. The section of the sweet potato plant consists mainly of stems and leaves. The purpose of this study is to obtain sweet potato cultivars with criteria of tubers and stover yields through agronomic experiments with different defoliation and cultivars. Factorial Randomized Design by placing Cultivars as the first factor, (C) included: C₁ (Beta-2), C₂ (Kuningan Merah), C₃ (BIS OP-61-OP-22). The second factor of Defoliated (D), namely : D₁ (Defoliation 16 wap), D₂ (Defoliation 12 wap), D₃ (Defoliation 8 wap), with 3 replications. The results showed that: A high RGR value is followed by a large price URLˊ, meaning that the balance of new plant material is related to the ability of plants to carry out photosynthesis. Cultivar value Beta-2 RGR (8-4) = 71 mg.gˉ¹ dayˉ¹, Kuningan Merah URLˊ(8-12) = 65 mg.cmˉ². BIS OP-61-OP-22 cultivars produce large criteria (51.22 tubers/plot) and medium criteria (44.33 tubers/plot). Beta-2 cultivars produce small criteria (45.56 tubers/plot). Ratio F/R from BIS OP-61-OP-22 cultivars (high dual-purpose), cultivars Beta-2 and Kuningan Merah (high root production)
AbstrakSalah satu teknologi untuk meningkatkan produktivitas mentimun yaitu dengan aplikasi pemupukan. Penelitian bertujuan untuk menentukan pengaruh pupuk NPK dan pupuk organik cair yang kaya fosfat terhadap pertumbuhan vegetatif tanaman dan hasil dari tanaman mentimun. Penelitian ini dilaksanakan bulan Maret sampai Mei 2017 di kebun petani, Kelurahan Tlogomas, Kota Malang. Rancangan percobaan yang digunakan ialah Rancangan Acak Kelompok Faktorial yang terdiri dari dua faktor dan diulang 3 kali. Faktor pertama adalah dosis pupuk NPK, terdiri dari 4 taraf, yaitu 100 kg ha-1, 200 kg ha-1, 300 kg ha-1 dan 400 kg ha-1. Faktor kedua adalah dosis pupuk organik cair, terdiri dari 3 taraf, yaitu 100 cc L-1, 150 cc L:-1 dan 200 cc L-1. Pupuk organik cair terbuat dari campuran daun lamtoro dan air seni kambing. Adapun variabel pengamatan yang diamati yaitu tinggi tanaman, jumlah daun, dan berat buah. Hasil penelitian menunjukkan bahwa tidak ada interaksi antara pupuk NPK dan pupuk organik cair. Bobot buah mentimun tertinggi dicapai pada aplikasi pupuk NPK dengan dosis 200 kg ha-1sedangkan pada aplikasi pupuk organik cair dengan dosis 100 cc L-1Kata kunci : NPK, Pupuk organik cair, Mentimun.AbstractOne of the technologies to increase cucumber productivity is fertilization application. The aim of this study was to determine the effect of NPK and high phosphate liquid organic fertilizers on vegetative growth and yield of cucumber plants. This research was conducted from March to May 2017 in the farmer's garden, Tlogomas Village, Malang City. The experimental design used factorial randomized block design that consisted of two factors and repeated 3 times. The first factor was NPK fertilizer doses, that consisted of 4 levels, there were 100 kg ha-1, 200 kg ha-1, 300 kg ha-1 and 400 kg ha-1. The second factor was organic liquid fertilizer doses, that consisted of 3 levels, there were 100 cc L-1, 150 cc L-1 and 200 cc L-1. Organic liquid fertilizer was made from Leucaena leucocephala leaves and goat urine. The observed variables were plant height, number of leaves, and fruits weight. The results showed that there was no interaction between NPK and liquid organic fertilizers. The highest cucumber fruit weight was achieved in the application of NPK fertilizer at a dose of 200 kg ha-1 while in the application of liquid organic fertilizer at a dose of 100 cc L-1.Keyword : NPK fertilizer, Organic liquid fertilizer, cucumber
Indawan et al, 2019. Increasing Sweet Potato Yield on Biochar Amendment Application on Sub-Optimal Dry Land. JLSO 8(1):47-56. Biochar is a soil amendment that can improve soil fertility, increase crop yield and can reduce contamination. This study aim to evaluate the sweet potato response to biochar application from tobacco industry waste. The combination of cultivar and dose of biochar implemented using a Split Plot Experiment Design with three replications. The cultivars placed 0n main plots and biochar doses on sub-plots. The thirteen cultivars covering 7 varieties (Kuningan Putih, Beta 1, Beta 2, Kuningan Merah, Sari, Boko, and Jago) plus six accession from Unitri and Brawijaya University collections (BIS OP-61-OP-22 , 73-6 / 2, 73 OP-8, BIS OP-61, 73 OP-5, and BIS OP-61-♀-29). The biochar dose used was B0 (0 t / ha) and B1 (5 t / ha). The experimental unit is measuring 5 m x 0.6 m, consisting of single row and planted with a spacing of 25 cm in row or 20 cuttings/row). The storage root numbers, storage root weight, % dry matter, Harvest Index (HI) and yields estimation are ditermined. The results showed that sweet potato cultivars gave a significant response to biochar application on fresh storage root weight, dry storage root weight, biomass dry weight, HI and storage root yields, but no interaction between cultivars and biochar doses. Storage root yield range of 8 - 21 t / ha without biochar and 10 - 23 t / ha with biochar 5 t / ha, except for Beta 1 and Boko. The use of biochar of 5 t / ha can increase storage root yields ranging from 8 - 45%.
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