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All Journal JURNAL AGRICA Jurnal Agro Estate
Hamzah Manurung
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Agriculture, Biological Sciences & Forestry

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The THE EFFECTS OF COMPOSTS AND NPK DOSAGE TO THE GROWTH OF OIL PALM (Elaeis guineensis Jacq) AT MAIN NURSERY Siahaan, Megawati; Hamzah Manurung; Emil Adolf Behring Silalahi
Agro Estate Vol 8 No 2 (2024): Desember 2024
Publisher : Institut Teknologi Sawit Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47199/jae.v8i2.262

Abstract

One of the problems in nursery is difficulties to find topsoil and  using of subsoil will be alternative. The objectives of this research were knowing the effects of kinds of compost, compound NPK dosage and interaction of them at oil palm in main nursery. Randomized block design was used with kinds of compost (J) and compound NPK dosage (D) as treatments; without compost (J1),  rice straw compost (J2), sawdust compost (J3) and empty palm oil bunches compost (J4); without compund NPK (D0), ½ of recomendation compound NPK dosage (D1), ¾ of  recomendation compound NPK dosage (D2) and ¾ of recommendation compound NPK dosage (D3); The research shows that height of plant at 6-12 weeks after planting, amount of leave at 10-12 weeks after plantings, stem diameter 7-12 weeks after planting,  fresh weight of  shoot and root at 12 weeks after plantings are significantly affected by kinds of compost (J). Heigh of plants at 6-12 weeks after plantings, stem diameter at 6-12 weeks after plantings, fresh and dry shoot weight at 12 weeks after planting are significantly affected by Compound NPK dosage.  Heigh of plants at 7-12 weeks after planting, stem diameter 3-5 weeks after planting, dried roots weight at 12 weeks after planting are affected by interaction of kinds of compost and  compound NPK dosage. J3 as compost from oil palm empty bunch; D3 as recommendation dosage compound NPK and K3D2 is better than the others.  
Pengaruh Disiplin Kerja dan Usia Terhadap Kinerja Karyawan Pemanen di Afdeling 1 PT Perkebunan Nusantara IV Regional II Kebun Tinjowan Ryan Darmawan Dalimunthe; Hamzah Manurung
JURNAL AGRICA Vol. 19 No. 1 (2026): JURNAL AGRICA
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/agrica.v19i1.17641

Abstract

This study aims to analyze the influence of work discipline and age on the performance of harvesters at Afdeling 1 of PT Perkebunan Nusantara IV Regional II Tinjowan Plantation. The method used was quantitative descriptive, with a population of 21 harvesters, all of whom were included in the sample using a saturated sampling technique. Data were collected through a questionnaire using a Likert scale, observation, and documentation, then analyzed using multiple linear regression with the aid of SPSS version 25. The results indicate that, simultaneously, work discipline and age have a positive and significant effect on employee performance. Partially, work discipline significantly affects performance, while age also significantly affects performance. The results of the coefficient of determination analysis indicate that work discipline and age account for 49% of employee performance, while the remainder is influenced by other factors outside the scope of this study. Thus, improving work discipline and managing the workforce based on productive age can enhance the performance of harvesters.
Co-Authors Emil Adolf Behring Silalahi Ryan Darmawan Dalimunthe Siahaan, Megawati