Sigit Sudjatmiko

Effects of Madagascar Periwinkle Leaf Extract (Catharanthus roseus (L.) G.Don, Apocynaceae) on the Agromorphophysiological Characteristics of Dendrobium sp. during Acclimatization Phase

Lisa Regyna Ardianingrum, Marlin Marlin, Marulak Simarmata, Sigit Sudjatmiko & Reny Herawati · Asian Plant Research Journal · 2026

This study aimed to determine the effects of different concentrations of Catharanthus roseus leaf extract on the morphological characteristics of Dendrobium orchids. The research was conducted in the greenhouse of the Agronomy Laboratory, Faculty of Agriculture, University of Ben...

Open access Research Article 10.9734/aprj/2026/v14i4389

Autotoxicity of Rice Straw Extract on Germination, Growth, and Yield of Rice (Oryza sativa L.)

Algi Delana, Uswatun Nurjanah, Nanik Setyowati, Sigit Sudjatmiko & Muhimmatul Husna · Asian Journal of Advances in Agricultural Research · 2025

Rice is a major global staple, but its cultivation faces weed challenges, prompting herbicide use that harms the environment. Rice straw contains allelopathic compounds with bioherbicidal potential, yet these substances may also cause autotoxic effects on rice, impacting its grow...

Open access Research Article 10.9734/ajaar/2025/v25i8656

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

Growth and Yield Response of Soybean (Glycine max (L.) Merril) to Application of Water Hyacinth Compost (Eichornia crassipes) and SP-36 Fertilizer in Ultisols

Faidah Wahyu Rismawati, Hesti Pujiwati, Nanik Setyowati, Catur Herison & Sigit Sudjatmiko · Asian Journal of Research in Agriculture and Forestry · 2025

Fertilization is one of the key factors in soybean cultivation to increase growth and yield, particularly when using organic materials such as compost and inorganic fertilizers like SP-36. The study aimed to evaluate the effect of compost and SP-36 fertilizer on soybean growth an...

Open access Research Article 10.9734/ajraf/2025/v11i3426