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All Journal Journal of Tropical Soils Journal of Degraded and Mining Lands Management Agroekotek View Melati: Jurnal Media Komunikasi Ilmu Ekonomi Acta Solum
Muhammad Mahbub, Muhammad
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Economics, Econometrics & Finance Environmental Science

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 1 
GAYA KEPEMIMPINAN TRANSFORMASIONAL DAN MOTIVASI KERJA TERHADAP KEPUASAN KERJA KARYAWAN Puji Lestari, Endang; Dzikri Abadi, Muhammad; Mahbub, Muhammad
Media Komunikasi Ilmu Ekonomi Vol 40 No 2 (2023): MELATI: Jurnal Media Komunikasi Ilmu Ekonomi Desember 2023
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Institut Teknologi dan Bisnis Ahmad Dahlan Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58906/melati.v40i2.147

Abstract

Tujuan dari penelitian ini adalah untuk menguji pengaruh gaya kepemimpinan transformasional dan motivasi kerja terhadap kepuasan kerja karyawan PT. Kartika Panca Jaya Gresik. Penelitian ini menggunakan metode kuantitatif. Data dikumpulkan melalui observasi dan penyebaran kuesioner dan dianalisis secara kuantitatif menggunakan regresi linier berganda. Populasi dalam penelitian ini adalah seluruh karyawan PT. Kartika Panca Jaya yang berjumlah 47 orang. Teknik pengambilan sampel yang digunakan adalah sampling jenuh yakni semua anggota pupulasi dijadikan sampel penelitian. Hasil penelitian ini menyimpulkan bahwa  terdapat pengaruh yang signifikan antara gaya kepemimpinan transformasional dan motivasi kerja terhadap kepuasan kerja karyawan. Kesimpulan ini diperoleh melalui analisis data yang menunjukkan hubungan positif antara kedua variabel tersebut dengan kepuasan kerja. Secara bersama-sama, gaya kepemimpinan transformasional dan motivasi kerja memiliki dampak yang sinergis terhadap kepuasan kerja. Kombinasi antara kepemimpinan yang efektif dan motivasi yang tinggi menciptakan lingkungan kerja yang positif, meningkatkan produktivitas, serta mengurangi tingkat stres dan turnover karyawan.
Changes in properties of reclaimed-mine soil, plant growth, and metal accumulation in plants with application of coal fly ash and empty fruit bunches of oil palm Saidy, Akhmad Rizalli; Priatmadi, Bambang Joko; Septiana, Meldia; Ratna, Ratna; Fachruzi, Ismet; Ifansyah, Hairil; Hayati, Afiah; Mahbub, Muhammad; Haris, Abdul
Journal of Degraded and Mining Lands Management Vol. 11 No. 3 (2024)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2024.113.5767

Abstract

Reclaimed-mining soil (RMS) is characterized by low fertility, acidic pH, and high heavy metal contents. As a result, adding amendments becomes essential to support plant growth. Therefore, this research measured alterations in the characteristics of RMS, plant growth, and metal accumulation in plants with the co-application of coal fly ash (CFA) and empty fruit bunches of oil palm (EFBOP). In the first experiment, various levels of CFA (0, 75, and 150 Mg ha-1) and EFBOP (0, 25, and 50 Mg ha-1) were added to the RMS and then incubated at 70% water holding capacity for 45 days to determine their effect on changes in soil properties. In the second experiment, four treatments: control, CFA, EFBOP, and CFA+EFBOP were tested in the greenhouse to quantify their effects on the growth and metal accumulation of plants. Results of the study showed that the co-application of CFA and EFBOP significantly affected bulk density, pH, mineral nitrogen (NH4+ and NO3-), available phosphorus, and exchangeable Ca and Mg in RMS. CFA application increased exchangeable Al by 82-160%, while EFBOP resulted in a decrease of 24-119%. CEC decreased with CFA application and increased with the use of EFBOP. Plant growth increased with the co-application of CFA and EFBOP. The addition of CFA to soils results in increasing metal contents in plant tissue; however, the presence of EFBOP reduced the concentrations of metal in plant tissue. These results highlight the potential of CFA and EFBOP, which are industrial and agricultural wastes, as valuable soil amendments.
Aplikasi Komposisi Dosis Pemupukan NPK Dalam Pupuk Urea, TSP Dan KCl Berdasarkan Metode Diagnosis and Recommendation Integrated System (DRIS) Untuk Tanaman Cabai Besar (Capsicum annum L.) Pada Tanah Mineral Masam Gunung Kupang Kecamatan Cempaka Banjarbaru Maulana, Irfan; Mahbub, Muhammad; Syaifuddin, Syaifuddin
Agroekotek View Vol 7, No 1 (2024)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/agtview.v7i1.5596

Abstract

Big chili is a type of national superior vegetable commodity whose productivity will always be increased. Balanced fertilization is a solution to increase the production of big chilies, in analyzing crop yields the recommendation for balanced fertilization in an integrated manner is the dris method. This research to determine the effect of balanced fertilization of NPK in urea, TSP and Kcl based on the DRIS method on  number of leaves,  number of branches, plant height, flowering time, wet weight and dry weight. This research was carried out in an Agroecotechnology's greenhouse from July to September 2021. The research method used onefactor RAL with 6 treatments; D0 (control), D1 (0.90 g Urea + 0.09 g TSP + 1.94 g KCl), D2 (1.35 g Urea + 0.09 g TSP + 2.08 g KCl), D3 (1 .80 g Urea + 0.09 g TSP + 2.31 g KCl), D4 (2.70 g Urea + 0.09 g TSP + 2.78 g KCl), D5 (3.15 g Urea + 0.09 g TSP + 2.79 g KCl) and repeated four times to obtain 24 experimental units. The results of this research showed that D1 had a significant effect on plant height.
Pengaruh Pemberian Kombinasi Limbah Decanter Solid dan Abu Boiler Kelapa Sawit terhadap Perubahan Beberapa Sifat Kimia Tanah Ultisols Nurjanah, Riska Fitrianty; Mahbub, Muhammad; Ifansyah, Hairil
Acta Solum Vol 3 No 2 (2025): Maret 2025
Publisher : Department of Soil, Faculty of Agriculture, Lambung Mangkurat University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/actasolum.v3i2.2883

Abstract

Ultisols is an acid mineral soil that has various problems namely high soil acidity, Al3+ concentration and nutrient poor. One way to increase soil fertility and quality is by using ameliorant. Palm oil waste can be used to make ameliorant. Palm oil decanter cake and palm oil boiler ash are the types of palm oil waste used in this research. Providing Palm oil decanter cake and palm oil boiler ash can increase pH, available N-mineral, P concentration, and K-dd in Ultisols. The aim of this research is to determine the effect of providing waste decanter solid and palm oil boiler ash on changes in several chemical properties of Ultisols soil and the best combination of palm oil solid waste (decanter solid) and palm oil boiler ash to improve several soil chemical properties, namely, pH, availability of nitrogen, phosphorus and potassium in Ultisols soil. This research used a Completely Randomized Design Method factorial with two factors, the first factor being a Palm oil decanter cake (0, 5, and 10 t ha-1) and the second factor is palm oil boiler ash (0, 5, and 10 t ha-1), with three repetitions. This research was carried out in a greenhouse and analyzed in a soil physics, chemistry and biology laboratory. The research results show a combination of Palm oil decanter cake and palm oil boiler ash have a significant effect on pH, N-mineral concentration, and available P and palm oil boiler ash itself can increase the concentration of K-dd.
Variable Charge of Ultisols due to Phosphate Application and Incubation Time Mahbub, Muhammad
JOURNAL OF TROPICAL SOILS Vol. 15 No. 2: May 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i2.103-109

Abstract

Variable Charge Ultisols due to Phosphate Application and Incubation Time (M Mahbub): The laboratory experiment was conducted to study the effect of phosphate (P) application and its incubation time on pHo (pH at the point of zero charge) and variable charge of ultisols . The determined parameters were pHo and variable surface-charges.  Soil samples  were added by 0,  375  and 1,125 mg P kg-1 (or 0, 50 and 150% of the P sorption maximum, respectively).  Then, they were incubated for 2, 4, 6 and 8 weeks.  The variable surface-charges and pHo were determined by using the activity of potential determining ions (H+ and OH-) within two salt concentrations as counter ions (0.1N and 0.001N CaCl2) through a potentiometric titration method. The results  were indicated that the high P sorption and 766 mg P kg-1 in maximum  sorption were due to high contents in clay fractions and aluminum as well as low pH of experimental soil.  Application of P and incubation time were able to decrease pHo and to increase negative surface-charges.  Additionals of 375 and 1,125 mg P kg-1 incubated for 8  weeks gave  the value of pHo 2.86 and 2.69; as well as the magnitude  of  negative  charges 14.48 and 16.76 cmol(-).kg-1, respectively (both for 0.001N CaCl2).   For  pH > pHo  (the characteristic of  variable charge soils), the higher  the salt (CaCl2) concentration and pH solution,  the higher the negative surface-charge.
Co-Authors Abdul Haris Afiah Hayati Bambang Joko Priatmadi Fachruzi, Ismet Hairil Ifansyah Irfan Maulana, Irfan Meldia Septiana Nurjanah, Riska Fitrianty Puji Lestari, Endang Ratna Ratna Saidy, Akhmad Rizalli Syaifuddin Syaifuddin Zuraida Titin Mariana