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Zainal Muktamar

Publications (11)

Humic Acid-induced Changes in Soluble Cadmium and Associated Chemical Properties of Entisols and Inceptisols

Zainal Muktamar, Yestisia Sastri Gultom & Yudhi Harini Bertham · Asian Journal of Soil Science and Plant Nutrition · 2025

Aims: The aim of the study was to determine the concentration of soluble Cd and selected chemical properties after the application of humic acid in Inceptisols and Entisols. Study Design: The experiment used a completely randomized design (CRD) with 2 factors. The first factor wa...

Open access Research Article 10.9734/ajsspn/2025/v11i4598

The Availability of Soil N, P, K, and Mustard Yield after the Application of Liquid Organic Fertilizer from Household Waste in Ultisols

Zainal Muktamar, Vikra Zanovid, Bandi Hermawan, Anandyawati, Kartika Utami & Nanik Setyowati · International Journal of Plant & Soil Science · 2024

Ultisols are one of the dominant soil orders in Indonesia, accounting for approximately 25% of the total land area. The main problem of this soil is high aluminum (Al) saturation with low pH and plant nutrients. The study was intended to determine the effect of liquid organic fer...

Open access Research Article 10.9734/ijpss/2024/v36i54510

Performance of Sweet Corn and Increasing Soil Total Nitrogen after the Application of Vegetable Waste-Based Liquid Organic Fertilizer in Coastal Entisols

Zainal Muktamar, Dicky P. Sinaga, Heru Widiyono, Herry Gusmara & Bambang G. Mucitro · International Journal of Plant & Soil Science · 2023

Coastal Entisols generally have coarse-textured, low organic matter and total soil nitrogen (N), and low water holding capacity. The liquid organic fertilizer is expected to increase soil organic matter in soil. The study's objective was to determine the total soil organic carbon...

Open access Research Article 10.9734/ijpss/2023/v35i213968

Ameliorative Effect of Humic Acid Extracted from Imperata cylindrica Compost on Selected Chemical Properties of Soil in Coastal Region of Indonesia

Yanuavitha T. E. Suci, Zainal Muktamar, Fahrurrozi Fahrurrozi, Mohammad Chozin & Sigit Sudjatmiko · International Journal of Plant & Soil Science · 2026

Acid Inceptisols are commonly found in coastal region of Bengkulu Province, Indonesia. This particular soil faces serious problem such as low pH, high aluminum (Al) saturation and low fertility. Humic acid extracted from cogon grass (Imperata cylindrica) benefits to improve chemi...

Open access Research Article 10.9734/ijpss/2026/v38i36000

Assessment of Cellulolytic, Potassium and Phosphate Solubilizing of Bacteria from Bali Cattle Rumen as Potential Compost Bioactivators

Neli Definiati, Zainal Muktamar, Nanik Setyowati, Nurmeiliasari, Fahrurrozi & Sukisno · Journal of Advances in Biology & Biotechnology · 2025

Rumen fluid of Bali cattle contains a highly diverse and functionally active bacterial community, offering valuable potential for compost bioactivation. This study aimed to isolate and characterize cellulolytic, phosphate and potassium-solubilizing bacteria from the rumen and ass...

Open access Research Article 10.9734/jabb/2025/v28i72606

Agronomic and Physiological Responses of Sweet Potato to Moringa Leaf–seaweed Liquid Organic Fertilizer in Coastal Soil

Haryuni Haryuni, Fahrurrozi Fahrurrozi, Zainal Muktamar, Nanik Setyowati, Supanjani Supanjani, Catur Herison & Widodo Widodo · International Journal of Plant & Soil Science · 2026

Aims: To determine the physiological and agronomic responses of sweet potato plants to the application of liquid organic fertiliser (LOF) prepared from moringa leaves and seaweed, and to identify the best moringa leaf-seaweed LOF combination for sweet potato growth and yield in c...

Open access Research Article 10.9734/ijpss/2026/v38i86208

Modification of Synthetic Nitrogen Fertilization Using Goat Manure in Sorghum (Sorghum bicolor L.) Cultivation

Nanik Setyowati, Jessica Putri Utami, Zainal Muktamar, Uswatun Nurjanah, Widodo Widodo & Muhimatul Husna · Asian Research Journal of Agriculture · 2026

Sorghum (Sorghum bicolor L.) is a resilient cereal crop widely cultivated in marginal environments; however, its production often relies heavily on costly synthetic nitrogen fertilizers which also pose environmental concerns. Integrating organic nutrient sources such as goat manu...

Open access Research Article 10.9734/arja/2026/v19i1804

Sphagneticola trilobata Compost as a Sustainable Substitute for Synthetic Nitrogen in Sweet Corn Cultivation

Mario, Nanik Setyowati, Zainal Muktamar, Fahrurrozi, Eko Suprijono & Putri Mian Hairani · Asian Journal of Advances in Agricultural Research · 2025

Sustainable fertilization strategies are essential for improving crop productivity while maintaining soil health. This study evaluated the effects of partial substitution of synthetic nitrogen (N) fertilizer with Sphagneticola trilobata (L.) Pruski compost on soil nitrogen and sw...

Open access Research Article 10.9734/ajaar/2025/v25i11687

Utilizing Melastoma Compost (Melastoma malabatrichum L.) as a Sustainable Alternative to Synthetic Nitrogen Fertilizers in Shallot Cultivation

Dinna Khoirya, Nanik Setyowati, Zainal Muktamar, Kartika Utami, Marwanto & Sumardi · International Journal of Plant & Soil Science · 2025

Aims: This study explores the potential of Melastoma compost (Melastoma malabatrichum L.) as a sustainable alternative to synthetic nitrogen fertilizers in shallot (Allium ascalonicum L.) cultivation. Study Design:  This study was conducted from July to October 2024 at the Green...

Open access Research Article 10.9734/ijpss/2025/v37i25316

The Applications of Compost and Ca (OH)2 to Overcome Cadmium (Cd) Contamination in Inceptisols

Tira Yustianingrum, Abimanyu Dipo Nusantara, Zainal Muktamar, Nanik Setyowati & . Anandyawati · Journal of Experimental Agriculture International · 2022

Heavy metals contribute to soil contamination and can decrease soil productivity. Compost and Ca(OH)2 can restore heavy metal contaminated soil. The purpose of this study was to examine the effectiveness of compost and Ca(OH)2 in reducing cadmium (Cd) contamination in Inceptisols...

Open access Research Article 10.9734/jeai/2022/v44i330806

Effect of Planting Patterns and Mulch Types on Weed Growth and Yield of Sweet Corn and Red Bean

Uswatun Nurjanah, Memed, Nanik Setyowati, Zainal Muktamar, Eko Suprijono & Edhi Turmudi · International Journal of Plant & Soil Science · 2023

This study aimed to determine the best cropping pattern and type of mulch in the intercropping system of sweet corn and red beans in organic farming systems. The research was conducted in Air Duku Village, Bengkulu at 1054 m above sea level. The experimental design was RCBD with...

Open access Research Article 10.9734/ijpss/2023/v35i52817