Di Maluku Utara, perkebunan kelapa umumnya ditanam secara monokultur. Menanam kedelai di antara tegakan kelapa diharapkan dapat meningkatkan pendapatan petani dan pemanfaatan lahan. Penelitian bertujuan untuk mengetahui tingkat adaptasi beberapa varietas unggul kedelai pada sistem tanam tumpangsari di antara tegakan kelapa. Penelitian dilaksanakan di lahan perkebunan kelapa umur 10-15 tahun, jenis tanah inceptisols, Desa Bumi Restu, Kecamatan Wasile Timur, Kabupaten Halmahera Timur mulai bulan Juni hingga September 2018. Penelitian menggunakan RAK Faktorial, dengan lima ulangan. Faktor pertama adalah empat varietas kedelai (Dering 1, Demas 1, Devon 1 dan Burangrang). Faktor kedua adalah jenis pemupukan (pupuk organik, pupuk organik + pupuk NPK phonska, dan pupuk organik + pupuk NPK phonska + pupuk Urea). Hasil penelitian menunjukkan bahwa kedelai dengan populasi 80% dapat ditanam secara monokultur di bawah tegakan kelapa dengan intensitas cahaya hingga 40%. Kombinasi perlakukan varietas Dering 1 dengan pupuk organik 2 t/ha mampu menghasilkan biji 1,52 ton/ha, lebih tinggi dibandingkan varietas kedelai lainnya. Jumlah polong tertinggi dihasilkan oleh varietas Demas 1 yaitu 114 polong/tanaman. Varietas Dering 1 dan Demas 1 berpotensi untuk dikembangkan di lorong-lorong lahan perkebunan kelapa umur 10-15 tahun dengan intensitas cahaya hingga 40%. Penanaman kedelai tersebut layak untuk dikembangkan, karena petani kelapa dapat tambahan keuntungan sebesar Rp. 4.402.000/panen kedelai dengan nilai R/C 1,55.<br /><em></em><em></em><p align="justify"> </p>
Aims: The objective of this study was to determine the optimal fertilizing method and NPK fertilizer dosage for plant physiology and nutmeg yield. Study Design: The experimental design was a completely randomized block design (CRBD) in a 4x3 factorial arrangement with three replicates. The first factor was four NPK fertilizer doses: 1, 1.5, 2.0, and 2.5kg NPK (15:15:15)/tree/year. The second factor was the manner of fertilizer application: (1) fertilized in spot, (2) fertilized in-furrow trenches trunked and (3) fertilized in hole. Place and Duration of Study: The research was conducted in Tobelo North Halmahera (1°44'45.3"-1°44'54.4" N, 127°59'54.4"-127°59'53.2" E), North Maluku, Indonesia from January 2019 to May 2020. Methodology: The nutmeg trees used was 30 years old. The population of trees plants in the study area was 40 trees. Observation parameters on leaves are chlorophyll a, b and total, nitrate reductase activity (NRA), N, P, K, proline content, number of young and old fruits. Results: The fertilization treatment with the fertilizer application method into the crack/hole fertilizer with a dose of 2.5 kg NPK significantly produced high levels of chlorophyll a, chlorophyll b, total chlorophyll of leaves and old fruit. The number of old fruits is positively correlated with chlorophyll a content (0.615*), chlorophyll b (0.663*), total chlorophyll (0.634*) and number of young fruits (0.748 **). The application of fertilizer hole produces plants that recover quickly from drought stress, as evidenced by the highest proline content. Conclusion: NPK fertilization using the hole method and at doses of 2.0-2.5 kg/tree/year are recommended for improving plant physiology and yield.
Approximately 80% of the land under the stands of coconut trees has the opportunity for intercropping. Corn farming under coconut stands can increase the efficiency of land use and provide additional income to farmers. One of the determinants of the success of increasing crop production is through balanced and fertilization rational and the use of superior varieties. The study aims to determine the effect of type, dose, and time of fertilization of corn on dry land under coconut stands. The study was conducted from June to October 2018 in Bumi Restu Village, Wasile District, East Halmahera Regency. The results showed that maize production in 40% shade conditions under coconut stands was influenced by the variety and fertilization, but only one variable interacted namely dry shelled weight.. Corn production on dry land under coconut stands achieved by the four varieties (Variety Nasa 29, Sukmaraga, Bhishma, and Lamuru) are as follows; 5.5 tons/ha; 4.7 tons/ha; 5.3 tons/ha and 5.2 tons/ha at a dosage of organic fertilizer 2.000 kg/ ha,NPK Phonska 450 kg/ha, and urea 150 kg/ha. The Bisma and Lamuru varieties are shade tolerant and can be grown on dry land under the stands of coconut.
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