The aim of this study: (1) To determine the effect the combination of the dose and time application of urea fertilizer on the growth and yield of sweet corn (Zea mays Var.Saccharata Sturt) Cultivars Bonanza F1. (2) To determine the effect the combination of the best dose and time application of urea fertilizer on the growth and yield of sweet corn (Zea mays Var.Saccharata Sturt) Cultivars Bonanza F1. The research was conducted in the village of Susukan Tangkil District of Cirebon - West Java, from September until November, 2018.The research method used was the experimental method with a randomized block design (RAK). This experiment consisted of nine combinations dosage of potassium fertilizer and tillage systems each repeated three times, so there are 27 experimental plots. The combination treatment was tested in the field are: A (urea fertilizer 50 kg/ha and one time application), B (urea fertilizer 50 kg/ha and two time application), C (urea fertilizer 50 kg/ha and three time application), D (urea fertilizer 100 kg/ha and one time application), E (urea fertilizer 100 kg/ha and two time application), F (urea fertilizer 100 kg/ha and three time application), G (urea fertilizer 150 kg/ha and one time application), H (urea fertilizer 150 kg/ha and two time application), I (urea fertilizer 150 kg/ha and three time application).The results showed that: (1) There is a real effect treatment the combination of the dose and time application of urea fertilizer on plant height age of 47 and 54 Days After Planting (DAP), the number of leaves per plant of 47 and 54 Days After Planting (DAP), diameter of age stem of 47 and 54 Days After Planting (DAP), the length and diameter of the cob with husk, and corncob with husk per plot. (2) The combination of dose and time application of the best urea fertilizer from cob weighted per plot in treatment I (urea fertilizer 150 kg/ha and three time application) with weight 9,07 kg equal to 19,33 ton/ha.

This study aims to determine the effect of the combined concentration of shallot extract and cutting material on growth of jasmine (Jasminum sambac. L). This research was carried out in the village of Cilengkrang Girang, Pasaleman District, Cirebon Regency. In April to July 2021. The method in this research is the experimental method with non factorial completely randomized design. The treatment consisted of combination of cutting materials and shallot extract concentration. (A)= top stam cutting + concentration of 50%, (B) = middle stam cutting + concentration of 50%, (C)= bottom stam cutting + concentration of 50%, (D)= top stam cutting + concentration of 75%, (E)= middle stam cutting + concentration of 75%, (F)= bottom stam cutting + concentration of 75%, (G)= top stam cutting + concentration of 100%, (H)= middle stam cutting + concentration of 100%, (I)= bottom stam cutting + concentration of 100%. There were 9 treatment combinations repeated 3 times each, so there were 27 experimental unit treatments. The result show that the concentration of shallot extract and cutting material had no significant effect on growth of jasmine (Jasminum sambac. L) cultivar Bandar Arum.

This study aims to analyse the growth response of soybean (Glycine max (L.) Merrill) to the treatment of refugia plants and Nano silica fertilizer. The research was conducted at the Unit of Palawija Seed Development and Paddy, Agriculture Office of West Java Province, Plumbon, Cirebon Regency, from December 2018 to May 2019. The materials that were used include soybean varieties Grobogan, sunflowers, Zinnia elegant and marigolds, Nano silica fertilizers and NPK. This study uses a split plot design with the main plot was kind of refugia plants and sub-plots was Nano silica fertilizer concentration. The observed variables included plant height, stem diameter, number of leaves and number of branches, observations were made at the age of 14, 21, 28 and 35 days after planting (dap). The results showed that refugia plants had no effect on soybean growth, while the application of Nano silica fertilizer concentration of 1.75 ml/l and 3.50 ml/l gave the best effect on all components of soybean growth observed.

Pemangkasan (defoliasi) daun pada tanaman jagung terutama daun yang tidak produktif dianggap dapat meningkatkan hasil pada tanaman jagung karena mengurangi persaingan penggunaan hasil fotosintesis pada tanaman. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh posisi dan waktu pemangkasan daun terhadap hasil tanaman jagung. Penelitian dilaksanakan di Kabupaten Kuningan Jawa Barat dari Bulan Juni sampai September 2018. Rancangan percobaan yang digunakan adalah rancangan acak kelompok (RAK) yang terdiri atas 10 perlakuan yaitu kontrol (tanpa pemangkasan), pemangkasan tiga daun atas umur 50 hari setelah tanam (HST), pemangkasan satu daun atas dan dua daun bawah umur 50 HST, pemangkasan tiga daun bawah umur 50 HST, pemangkasan tiga daun atas umur 55 HST, pemangkasan satu daun atas dan dua daun bawah umur 55 HST, pemangkasan tiga daun bawah umur 55 HST, pemangkasan tiga daun atas umur 60 HST, pemangkasan satu daun atas dan dua daun bawah umur 60 HST, dan pemangkasan tiga daun bawah umur 60 HST. Masing-masing perlakuan diulang tiga kali. Hasil penelitian menunjukkan bahwa panjang tongkol, diameter tongkol, bobot tongkol, serta bobot tongkol per tanaman dan per petak tertinggi diperoleh pada perlakuan pemangkasan tiga daun bagian bawah pada umur 50 HST. Daun bawah seringkali ternaungi sehingga tidak aktif berfotosintesis sehingga menjadi organ sink dan berkompetisi dengan tongkol dalam memperoleh hasil fotosintesis.

The experiment was conducted to know the effect of chicken manure doses and nitrogen fertilizers on growth and yield of lettuce (Lactuca sativa L). The experiment was conducted at Kutawaringin Village, Selajambe District, Kuningan, West Java Province, from March until May 2018. The experimnetal design was used Randomized Completely Block Design (RBD) with factorial pattern. Each treatment was repeated three times. The treatment consisted two factors. The first factor was rates  of chicken manure that consisted four levels : K1 (0 ton/ha), K2 (10 ton/ha), K3 (20 ton/ha), K4 (30 ton/ha), while the second factor was nitrogen fertilizers rates which consist three levels : N1 (77 kg/ha), N2 (100 kg/ha), N3 (123 kg/ha). The result showed that there was an interaction effect between chicken manure doses and nitrogen fertilizers on root volume (28 days after planting), total weight per plant, total weight per plot, and total biomass. Independently, chicken manure doses gave significant effect of plant high, number of leafs, leaf area, relative growth rates (28 and 35 days after planting). While nitrogen fertilizers rates effected plant height, number of leaves, leaf area, net assimilation rates (21 days after planting), relative growth rate (21 and 28 days after planting), root volume (35 days after planting). Chicken manure doses 20 ton/ha and nitrogen fertilizers doses 123 kg/ha gave the best result on total weight per plant and per plot which produces 30,56 g per plant and 638,38 g per plot (2,5 ton/ha).