Lahan gambut memiliki karakteristik tanah dengan keasaman tinggi dan tingkat kesuburan yang rendah. Namun kurangnya nutrisi pada lahan gambut juga menyebabkan kondisi shrubby pada akasia. Penelitian ini bertujuan untuk menganalisis pengaruh pemberian pupuk Zincobor dan kombinasi Zincobor + Dolomit terhadap kelurusan batang dan tinggi tanaman akasia. Penelitian menggunakan rancangan nested design dengan lima ulangan dan empat perlakuan, yaitu kontrol, zincobor 20 g, zincobor 20 g + dolomit 250 g, dan zincobor 30 g. Pemberian pupuk dilakukan 1x dan dilakukan pengamatan pada hari ke – 0, 131, 355 setelah pengaplikasian pupuk. Uji kualitas tanah berdasarkan pH, tanah gambut memiliki pH yang rendah yaitu 3,41 – 3,7. Selain itu kandungan unsur mikro seperti Zink, Cu, dan Boron termasuk rendah. Berdasarkan hasil pengamatan, pemberian pupuk Zincobor dengan dosis 20 g menunjukkan nilai kelurusan yang diharapkan paling tinggi dibandingkan perlakuan lainnya. zincobor 20 g juga mampu meningkatkan ketinggian tanaman Akasia dan menurunkan potensi shrubby pada tanaman. Penelitian ini disimpulkan bahwa Zincobor 20 g merupakan dosis pupuk Zincobor yang optimum untuk meningkatkan pertumbuhan tanaman akasia.

Using modified SRI (The System Rice of Intensification) was aimed at determining the optimum planting range and frequency of weeds management that could increase rice productivity. The research was consisted of two factors, planting range and frequency of weeds management. The trials were arranged in factorial using Randomized Block Design (5x4) and three replications. The first factor was five levels of planting range, 20 x 20 cm; 20 x 25 cm; 25 x 25 cm; 25 x 30 cm; and 30 x 30 cm. While the second factor was four levels of weeds management (manually) frequency, once (30 days after planting (DAP); twice (20; 40 DAP); 3 times (20; 30; 40 DAP); and 4 times (10; 20; 30; 40 DAP). Parameters measured were the maximum number of tillers, crops growth rate, net assimilation rate, number of productive tillers, the weight of 1000 seeds, seeds weight per clump, and seeds weight per hectare. The result showed that planting range 20 cm x 25 cm and three times frequency of weeding per planting season was the best interaction with the productivity 9.005 t ha -1 . Rice cultivation technique by giving the height of water surface 10 cm under the soil surface, a distance of furrows 2 m, the dosage of compost 10 ton/ha, planting range 20 x 25 cm , and frequency of weeding three times per planting season could increase rice yield as much as 50.08 %.

Mikania micrantha is a weed that is commonly found on agricultural land. Environmentally friendly weed control can be done using bioherbicides because the materials used come from nature. Terminalia catappa contains secondary metabolites so that its bioactive compounds can be used as weed control. This study aims to determine the total secondary metabolite compounds of Terminalia catappa leaves and their effect on Mikania micrantha seed germination. This study used a factorial Completely Randomized Design (CRD). The first factor is various types of solvents aquadest, ethanol and methanol. The second factor was the concentration of the extract application 30%, 50%, 70% and repeated 3 times so that there were 27 experimental units. Data were analyzed using analysis of variance if it had a significant effect, further tests were carried out using 5% BNJ. The results showed that the Terminalia catappa leaf extract with distilled aquadest of 70% was able to prevent the seeds from germinating while the methanol and ethanol solvent extracts were able to inhibit the germination of Mikania micrantha seeds at an application concentration of 30%.

No abstract

No abstract