PENGARUH PEMBERIAN BAHAN HUMAT DARI EKSTRAK BATUBARA MUDA (Subbituminus) DAN PUPUK P TERHADAP SIFAT KIMIA ULTISOL SERTA PRODUKSI TANAMAN JAGUNG (Zea mays L.)

Abstract

Abstr actThe purpose of this research is to study interaction of humic substances extracted from subbituminus coal with P fertilizer on the chemical properties of Ultisol and crop production of corn (Zea mays L.). The experiment was designed in completely randomized design having 2 factors (4 x 4) with 3 replications. The first factor was dose of humic substances (A) which consists of 4 levels (A1 = 0 ppm, A2 = 400 ppm, A3 = 800 ppm, and A4 = 1200 ppm). The second factor was level of fertilizer P (B) (B1 = 100% recommendation, B2 = 75% recommendation, B3 = 50% recommendation, and B4 = 25%). The result showed that : 1) There is no interaction between humic substances and P fertilizer on the chemical nature of Ultisol and crop production of corn (Zea mays L.) 2) Use of humic substance for 800 ppm with some level of P fertilizer could improve some chemical properties of Ultisol such as decreased in content of Al-exch by 0,38 me/100 g soil, increased in P-available by 22,16 ppm, CEC by 8,42 me/100 g soil and P nutrient by 0,10 %, as well as corn yield by 25,67 g/pot compared to soil without humic substances 3) The use of SP-36 for 50 % with some level of humic substances increased in plant height by 26,58 cm, P nutrient by 0,11 %, and the use of 75 % SP-36 increased corn yield by 5,84 g/pot compared to 25% of P recommended.

Study of surface charge and chemical properties of ex-gold mining soil ameliorated with Indonesian sub-bituminous coal

“…In addition, increasing pH and application dose at a dose of 40 t ha -1 SC was best at increasing pH H 2 O by 0.37 and pH KCl of ex-gold mining soil by 0.07 at a dose of 40 t ha -1 SC, respectively, compared to controls. According to [7][8][9] the application of Subbituminous coal can increase the pH value of the soil because it has COOH and OH functional groups. SC has hydroxyl and carboxyl functional groups that can bind dissolved metals and increase soil pH.…”

“…The use of Indonesian sub-bituminous coal (SC) as a soil enhancer begins with its potential as a source of the highest humic material (HS) compared to other organic materials such as peat and compost. SC as HS has been used on marginal lands such as Ultisols and Oxisols [7][8][9][10][11][12]. The potential and usage of SC have been carried out, but in the context of managing heavy metals with high mobility, such as Hg, it has not been employed to adjust the soil's surface charge.…”

Pemanfaatan Tanah Bekas Tambang Untuk Pertumbuhan Tanaman Perkebunan

“…serta menghambat aktivitas biologi tanah. Hal ini sesuai dengan pendapat (Gunawan et al, 2019;Herviyanti et al, 2012;RR Darlita et al, 2017;Sufardi et al, 2017) bahwa pH tanah merupakan karakteristik kimia tanah yang sangat penting diketahui karena implikasi terhadap kualitas dan produktivitas lahan sehingga reaksi tanah berhubungan erat dengan kelarutan unsur hara, fiksasi ion tanah, toleransi tanaman, penyerapan hara, aktivitas mikroorganisme tanah dan jamur yang berkembang, jika rendahnya pH tanah akan menyebabkan menurunnya ketersediaan hara bagi tanaman.…”

The Growth of Oil Palm Seedlings using a Combination Medium of Organic Oil Palm Empty Fruit Bunch and NPK Fertilizer at Main Nursery

“…Anwar (2009) added that organic fertilizer such as OPEFB compost has the effect of increasing soil pore space for the better and providing nutrient intake in soil fauna so that nutrients are available for plant growth. Organic matter content in the soil can increase the effectiveness of inorganic fertilization because it can bind nutrients and increase the amount of negative charge so that the soil cation exchange capacity is high (Herviyanti et al 2012).…”