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All Journal SAINS TANAH - Journal of Soil Science and Agroclimatology
Purwanto Purwanto
Department of Soil Science, Faculty of Agriculture, Universitas Sebelas Maret, Surakarta
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Assessing soil fertility index under different forest land cover Widyatmani Sih Dewi; Purwanto Purwanto; Siti Solikhatun Anisa; Sri Hartati
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol 21, No 2 (2024): December
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/stjssa.v21i2.67056

Abstract

Soil fertility is often evaluated under various forest land cover types to determine the capacity of each area to support plant productivity. Therefore, this study aimed to (1) assess the current soil fertility status of six land cover types in the Alas Bromo educational forest of Universitas Sebelas Maret using the Soil Fertility Index method and (2) identify the factors influencing the status. The six different land cover types investigated in this descriptive-exploratory study using a survey method included (1) pine, (2) pine-mahogany, (3) mahogany, (4) mixed trees, (5) annual crops, and (6) pine replanting, with four repetitions. Furthermore, the composite soil sample represented each repetitive area, and the assessment results showed that the soil fertility status was categorized as low to moderate. The categorization order was mahogany>mixed trees>pine replanting>annual crops>pine>pine-mahogany which had fertility indices of 0.57, 0.56, 0.53, 0.51, 0.49, and 0.45, respectively. Soil fertility determinants across the six land cover types comprised litterfall, breast height diameter, and tree density. Future investigations should evaluate the relationship between litter quality, soil biota, and decomposition rate with fertility to identify the appropriate strategy for fertility enhancement on each land cover.
Optimizing Entisols properties and enhancing melon (Cucumis melo L.) yields using biofilm biofertilizer, organic matter, and NPK fertilization Sudadi Sudadi; Ongko Cahyono; Purwanto Purwanto; Retno Rosariastuti; Hadiwiyono Hadiwiyono; Azizah Anggun Febriana; Oca Higiawati; Adhia Azhar Fauzan
SAINS TANAH - Journal of Soil Science and Agroclimatology Vol. 23 No. 1 (2026): June
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/stjssa.v23i1.91478

Abstract

Entisols have significant agricultural potential but also limitation by a high sand fraction and unstable soil aggregates, leading to low nutrient levels and poor water-holding capacity. This study aims to determine the optimal combination of biofilm biofertilizer, organic matter, and NPK fertilizer to improve it soil properties and enhance melon yields (Cucumis melo L.). A completely randomized block design was employed, consisting of three treatment factors: biofilm biofertilizer (BiO2) formulation (without BiO2, formula 1, and formula 2), organic matter dosages (0, 1.25, and 2.5 kg plant-1), and NPK dosages (0%, 50%, and 100% of the recommended dosage). The variables observed included soil properties (bulk density, aggregate stability, soil organic carbon (SOC), and available phosphorus), melon growth and yield. Data was analyzed using ANOVA at a 95% confidence level, followed by Duncan’s Multiple Range Test (DMRT) if any significant effects. The results showed that the interaction among BiO2, organic matter, and NPK significantly affected soil properties, enabling a reduction in NPK applications by up to 50% when combined with BiO2 and organic matter. The application of 2.5 kg plant-1 of organic matteroutperformed 1.25 kg plant-1 in improving bulk density, aggregate stability, available-P, P-uptake, plant dry weight, and melon yields; however, significant differences between these doses were observed only for available P and P uptake. This study can serve as a reference for determining fertilizer dosages to increase melon yields while improving the soil properties of Entisols and expanding their agricultural use.
Co-Authors Adhia Azhar Fauzan Azizah Anggun Febriana Hadiwiyono Hadiwiyono Intan Lestari Prima Vera Oca Higiawati ongko cahyono Retno Rosariastuti Siti Solikhatun Anisa Sri Hartati Sudadi Sudadi Supriyadi Supriyadi Widyatmani Sih Dewi