Biochar enriched with fertilizers has the potential to improve the quality of acid soils. In the agricultural sector, it was reported that the sap of <em>Kappapychus</em><em> alvarezii</em> (K-sap) is often used as a biofertilizer. Therefore, this study aimed to (i) examine the character of biochar enriched with the K-sap and (ii) analyze the soil quality after incubation. This study was carried out using two treatment factors arranged in a randomized block design, namely the biochar dose at 0%, 2.5%, 5.0%, and 7.5% in weight and K-sap at concentrations of 0%, 5%, 10%, and 15%. Ten kilograms of acid soil were incubated with K-sap enriched biochar for up to 2 weeks in each experimental pot. The results showed that the absorption band increased with the K-sap concentration for the functional group associated with the OH-stretching of the biochar enriched with K-sap was stronger and wider than the unenriched. The peak elevation pattern detected by X-ray diffraction for all biochars was similar. The dosage of 7.5% biochar enriched with 5%-10% K-sap concentrations increased pH, EC, organic C, total N, C:N ratio, available P, and exchangeable K, Ca, Mg, and Si than those without treatment. Furthermore, ammonium and total spores of arbuscular mycorrhizal fungi decreased, flagellates increased with and without the biochar, while the nitrate, total bacteria, and fungi of all treatments were similar. Based on these results, it was concluded that biochar enriched with K-sap could improve the quality of acid soil.
Earthworms have the ability to create new conditions in the soil environment and modulate the growth of beneficial soil microbial populations. Imperata releases exudate which creates less suitable soil conditions for growing food crops and horticulture. This study aims to: (i) study the effect of the concentration of cogongrass root extract on the abundance of earthworms and arbuscular mycorrhizal fungi spores-(ii) to determine the effect of the soil-extract mixture engineered using earthworms on the upland rice growth for local Kambowa variety. The first experiment, extracts of cogongrass roots were made into five concentration levels, namely 0%, 20%, 40%, 60%, and 80%. Each concentration was mixed with soil from cogongrass land in a different vermireactor. In reactor, earthworms were released that had emptied their stomach contents, and were allowed to manipulate the mixture until the vemicast covered part of the soil surface. As a result, the total earthworms in all reactors were relatively the same, and the total spores of arbuscular mycorrhizal fungi in the soil treated with a concentration of 60% was the most. The second experiment, the upland rice seedlings were grown on engineered soils. The differences in height, leaf area, number of tillers, panicle length, and total spikelet’s per panicle were significantly, except for leaves number, wet weight, dry weight, and percentage of spikelet filled. In conclusion, earthworms as potential ecosystem engineers are utilized in ecological engineering of soil quality in land dominated by reeds vegetation for the development of upland rice cultivation areas, particularly the local varieties of Kambowa.
Southeast Sulawesi, which is located in the southeastern part of Sulawesi island, is one of the upland rice producers in Indonesia, although the cultivation in the area is still not optimal because the upland rice productivity is still considered low. Southeast Sulawesi has an extensive dry land area and local upland rice genotypes have good growth and yield potential. This study aimed to determine the differences in the growth of several local upland rice genotypes of Southeast Sulawesi which were cultivated in Kendari City. This paper is still focused on the vegetative growth of the genotypes tested. This research was carried out in Experiment Field 2, Faculty of Agriculture, Halu Oleo University, which is located in Kambu District, Kendari City, Southeast Sulawesi. The research was conducted using a randomized block design (RBD) consisting of 10 genotypes, namely Wagamba (V1), Wangkariri (V2), Momea (V3), Waburi-buri (V4), Konkep (V5), Bakala (V6), Wakawondu (V7), Tinangge (V8), Loiyo putih (V9) and Bombana (V10). Each treatment was repeated 3 times in order to obtain 30 experimental units. The results showed that potential genotypes that can be developed in Kendari City were Wakawondu genotype based on parameters of the number of tillers, plant height, and number of leaves, Wagamba genotype based on leaf width parameter, and Wangkariri genotype based on the flowering age and number of tiller parameter. Based on the overall performances, especially on the number of tillers (one of the most important parameters), in general Wakawondu is the most recommended genotype for further development.
Penelitian ini bertujuan untuk mengkaji pengaruh integrasi bio-invigorasi benih pratanam dan LEISA terhadap pertumbuhan dan hasil tanaman padi gogo lokal. Penelitian dilaksanakan di Desa Jati Bali Kecamatan Ranomeeto Barat Kabupaten Konawe Selatan Provinsi Sulawesi Tenggara pada tahun 2016, menggunakan rancangan Split Plot dalam RAK (Rancangan Acak Kelompok) dengan pola faktorial yaitu faktor pertama bio-invigorasi benih pratanam (B) terdiri dari dua taraf yaitu kontrol (tanpa perlakuan bio-invigorasi) (B0) dan serbuk bata merah + Bacillus sp. CKD061 (B1). Faktor kedua LEISA (pupuk organik plus + pupuk anorganik) terdiri dari 6 taraf yaitu kontrol (G0), pupuk organik plus 5 ton ha-1 (G1), pupuk NPK 250 kg ha-1 (G2), pupuk organik plus 5 ton ha-1 + pupuk NPK 250 kg ha-1 (G3), pupuk organik plus 5 ton ha-1 + pupuk NPK 125 kg ha-1 (G4), pupuk organik plus 5 ton ha-1 + pupuk NPK 62,5 kg ha-1 (G5). Perlakuan yang diuji 12 kombinasi perlakuan yang diulang 3 kali sehingga terdapat 36 unit percobaan. Data hasil pengamatan dianalisis dengan analisis ragam dan jika perlakuan berpengaruh nyata dilanjutkan dengan uji DMRT pada taraf kepercayaan α = 0,05. Hasil penelitian menunjukkan bahwa interaksi perlakuan bio-invigorasi benih pratanam (serbuk bata merah + Bacillussp. CKD061) dan LEISA (pupuk organik plus 5 ton ha-1 + pupuk NPK 250 kg ha-1) berpengaruh nyata terhadap panjang malai, jumlah gabah per malai, persentase gabah hampa per malai, dan dapat meningkatkan produksi hingga 5,18 ton ha-1 yang sama dengan perlakuan serbuk bata merah + Bacillus sp. CKD061 dan pupuk organik plus dosis 5 ton ha-1 + pupuk NPK 125 kg ha-1 (B1G4) yaitu 5,13 ton ha-1 atau masing-masing meningkatkan produksi sebesar 70,96% dan 69,31% dibandingkan dengan kontrol. Secara mandiri bio-invigorasi benih pratanam (serbuk bata merah + Bacillus sp. CKD061) atau LEISA (pupuk organik + pupuk NPK) berpengaruh sangat nyata terhadap jumlah anakan produktif, panjang malai, jumlah gabah per malai, persentase gabah hampa per malai, dan produksi padi gogo lokal. Kata Kunci : Rizobakteri,Bio-Invigorasi Benih, LEISA, Padi Gogo Lokal
Two experiments were conducted at (i) irrigated lowland, village of Bojong, Cikembar, Sukabumi Sub-district, Indonesia, from November 2011 to February 2012, and (ii) rain-fed lowland, village of Sanca, Gantar sub-district, Indramayu, Indonesia, from April to July 2012. The objective of the experiment was to determine the yield of drought-tolerant hybrid rice genotypes. A randomized block design with three replications was used. The treatment consisted of 8 hybrid rice genotypes (BI485A/BP3, BI485A/BP5, BI485A/BP10, BI485A/BP12, BI485A/BP15, BI599A/BP5, BI599A/BP15 and BI665A/BP6) and 2 check varieties (Hipa 7 and Ciherang) for the experiment in irrigated lowland, 4 hybrid genotypes (BI485A/BP3, BI485A/BP12, BI485A/BP15 and BI599A/BP15) and 3 check varieties (Hipa 7, IR64 and Limboto) for the experiment in rain-fed lowland. On irrigated lowland, all tested-genotypes produced grain yield per hectare, which was not significantly different from the check varieties Ciherang and HIPA 7. The yield of genotype BI485A/BP12, BI485A/BP15 and BI559A/BP15 under irrigated lowland showed non-significant different with check varieties Ciherang and Hipa 7, i.e 5.63, 6.87, and 6.30 tons ha-1, respectively. Genotype BI599A/BP15 under severe drought rain-fed lowland yielded 0.90 tons of grain ha-1, whereas Hipa 7 (hybrid variety, suitable for rain-fed lowland) and Limboto (drought-tolerant check variety) reached 0.34 and 0.29 tons ha-1, respectively. Genotype BI599A/BP15 is a new hybrid genotype that potential for advanced development in rain-fed lowland and in irrigated lowland with a high yield potential and quiet early-maturity age.
Seaweed extract is known to contain nutrients and growth-regulating substances that affect soil biota, and a source of protection against pests and diseases. Earthworm, which is an example of a soil biota and playing the role of ecosystem engineer, has the ability to produce suitable land biostructures, for the inhabitation of arbuscular mycorrhizal fungi (AMF), which has an impact on upland rice growth. Therefore, this study aims to determine, (i) the effect of seaweed extract on the population of earthworms and spores of arbuscular mycorrhizal fungi, and (ii) the impact of the engineered soil on the growth of local upland rice varieties. Furthermore, the extract of seaweed, such as Kappapychus alvarezii, was divided into five concentration levels, namely 0%, 20%, 40%, 60%, and 80%. Each treatment was drenched into the soil from the cogongrass vegetated area, mixed with 20 Pheretima sp., and maintained for 49 days in the greenhouse. The result showed that the total difference in the earthworms’ concentration treatments was not significant. It also showed that the total AMF spores in the engineered soil products of 20% concentration was the highest. Based on treatment with the earthworm engineered soil products, the highest and lowest vegetative growth and yield components of upland rice were observed at the concentrations of 80% and 0%, respectively. In conclusion, the application of seaweed extract to the soil did not significantly reduce the earthworm population. The extract concentration of 20% also increased the total AMF spore in the engineered soil. Moreover, highly treated engineered soil products increased the growth and yield components of upland Kambowa rice on cogongrass soils.
The use of organic matter, which has a long-term impact, increases soil fertility because it contains residue. The research examines how rice straw mulch and organic fertilizer residue affect glutinous corn yield. This study was carried out at the Faculty of Agriculture Field Laboratory, Halu Oleo University, from May to August 2022. This Experiment used a randomized block design with a split plot design. The main plot, i.e. residue of rice straw mulch (M): without the residue of rice straw mulch (M0), the residue of rice straw mulch 4 t ha-1 (M1), and 8 t ha-1 (M2). Subplot, i.e. residue of plus organic fertilizer (P): without the residue of plus organic fertilizer (P0), a residue of plus organic fertilizer 2,5 t ha-1 (P1), 5 t ha-1 (P2), and 7,5 t ha-1 (P3). The length of the cob measured without husk, fresh weight of the cob with husk and without husk, dry weight of the cob without husk, number of seeds per cob, seed weight per cob, the weight of 100 seeds, and yield. After conducting an ANOVA analysis of the data, proceed with DMRT at a significant level of 95% if the analysis yields a significant effect (Fhit> Ftab). The research results showed that rice straw mulch plus organic fertilizer residue significantly affected yield components and yield. The residue of rice straw mulch 8 t ha-1 (M2) and deposition of plus organic fertilizer 7,5 t ha-1 (P3) produce the highest glutinous corn yield, i.e. 2,38 t ha-1 and 2,34 t ha-1 or increasing 92% and 75% compared without treatment. For efficiency of costs and realizing sustainable agriculture, it is necessary to utilize residues of organic material in the cultivation of food crops.
The low yield of soybeans is caused by drought, soft organic matter, and space for irregular plant growth. This study examines how plant spacing, and straw mulch dosage affect soybean yield. The research was conducted from August to December 2021 at the Field Laboratory of the Faculty of Agriculture, UHO. The research tools used in this study were tractors, hoes, ruler meters, ovens, analytical scales, and other supporting equipment. The materials consisted of soybean of the Anjasmoro variety, straw mulch, and other supporting materials. The study used a split-plot design arranged in a randomized block design. The main plot is the spacing (J) which consists of 2 levels, namely 20 cm x 20 cm (J1) and 20 cm x 30 cm (J2). Subplots were the dose of straw mulch (M) which consisted of three levels, namely without straw mulch (M0), 4 tons ha-1(M1), and 8 tons ha-1 (M2). The observed variables included the total number of pods per plant, weight of 100 seeds (g), seed weight per plant (g), harvest index (IP), and yield (tons). ANOVA analyzed data, and statistically different were tested by DMRT (α=0.05) using SAS 9.2. The interaction of plant spacing and straw mulch an increasing: the total number of pods, the weight of 100 grains, grain weight, harvest index, and yield. Plant spacing of 20 cm x 30 cm and the straw mulch of 8 t ha-1 (J2M2) obtained a product of 2.18 t ha-1 (an increase of 44.4%) compared to a spacing of 20 cm x 20 cm and without straw mulch (J1M0).
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