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jurnal Ilmu Pertanian (Agricultural Science)
Published by Universitas Gadjah Mada
ISSN : 01264214     EISSN : 25277162     DOI : https://doi.org/10.22146/ipas
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Ilmu Pertanian (Agricultural Science) with registered number ISSN 0126-4214 (print) ISSN 2527-7162 (online) is a scientific open access journal published by Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI (Perhimpunan Sarjana Pertanian Indonesia). Ilmu Pertanian (Agricultural Science) provides a forum for the publication of scientific articles in the scope of agricultural sciences with priority on science and plant technology (plantation, horticulture, and forestry), including aspects of postharvest and socioeconomic. Ilmu Pertanian (Agricultural Science) is published three times annually, April, August, and December.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Pertanian dan Biologi (Lain-Lain)
Articles 532 Documents
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Analysis of factors affecting differences in potassium buffering capacity in several soil orders Fajarini, Permata Harty Noor; Hanudin, Eko; Purwanto, Benito Heru
Jurnal Ilmu Pertanian Vol 10, No 2 (2025): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.108285

Abstract

Each soil order has different reactivity to potassium ion retention capacity, especially potassium buffering capacity. These differences are related to soil characteristics, including clay mineral content and type, cation exchange capacity, and soil texture class. This study compared the potassium buffering capacity (PBCk) of Andisols, Alfisols, Inceptisols, and Vertisols. The PBCk experiment reacted 2.5 grams of air-dried soil (passing a 0.5 mm sieve) and 25 ml of KCl solution with a series of concentrations of 0, 25, 50, 75, 125, 150, 175, 200, 225, and 250 ppm. Then, it was shaken for 24 hours to reach equilibrium conditions. The next day, the solution was centrifuged to obtain a clear solution. The remaining K content in the equilibrium solution was measured using a flame photometer. The amount of K read was calculated to obtain the Q/I factor and PBCk value from the gapon equation. The Q/I relationship was used to estimate PBCk values for each soil order with changes in K in the solution or Q (∆K) as the X axis and the intensity of K or I (CRk) as the Y axis. Then, the K intensity data were connected to the PBCk results to determine the buffer capacity of the four soil orders. Vertisols showed the highest PBCk (1.099 cmol kg-1/mol L-1)0.5, followed by Andisols, Alfisols, and Inceptisols. The determining factors include clay minerals in the form of smectite (2:1), high CEC value, and soil texture dominated by clay.
Growth and development of ‘sweet net 9’ melon (Cucumis melo L.) in NFT hydroponics as affected by pruning leaves below fruits and foliar application of potassium sulphate (K2SO4) Pramono, Mellinia Valentiningtyas; Sulistyaningsih, Endang; Murti, Rudi Hari
Jurnal Ilmu Pertanian Vol 10, No 2 (2025): August
Publisher : Faculty of Agriculture, Universitas Gadjah Mada jointly with PISPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ipas.109300

Abstract

Leaf pruning reduces resource competition, directing assimilates to fruit development, while aging plants require supplemental K to support nutrient uptake. This study aimed to evaluate the effects of pruning leave below fruits and foliar application of K₂SO₄ on fruit weight and quality. The experiment was conducted over three months (October–December 2024) in a screenhouse at Pondok Pesantren Aqwamu Qila, Bantul, Yogyakarta. Sampling and analysis were carried out at the Crop Production Management Laboratory, Faculty of Agriculture, Universitas Gadjah Mada. A split-plot design was used with two factors, namely K₂SO₄ concentrations (0, 1, 2, 3 g/L) as the main plot and pruning (with/without) as the subplot, resulting in 8 treatment combinations replicated in 3 blocks. Data were analyzed using split-plot ANOVA in R-Studio, followed by DMRT at a 95% confidence level when significant differences were found. The study showed that pruning significantly increased leaf length (16.49%) and width (20.89%). The application of 0 g/L K₂SO₄ produced the highest harvest index (0.49), though not significantly different compared to that of 2 g/L and 3 g/L. Combining leaf pruning with 2 g/L K₂SO₄ resulted in a high leaf area and LAI (5.68), comparable to non-pruned plants with 3 g/L K₂SO₄ (5.83). This combination also yielded the highest fruit potassium content (1.90%) but lowered fruit sweetness (8.65 ˚Brix). The elevated potassium content may provide health benefits, particularly in reducing blood pressure.

Page 54 of 54 | Total Record : 532

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