Potato cultivation on the surface of the media faces obstacles in the form of high temperatures which cause the biosynthesis of gibberellins to increase and disrupt the tuberization process of potatoes. The use of hormonal engineering that can be done to increase the quantity and quality of G0 potato seeds is the use of retardant or anti-gibberellin Prohexadione-Ca with the right concentration and time of application. The experiment was carried out from June 2021 to February 2022 at Screen House, Ciparanje Jatinangor Experimental Garden, and Hortiklutura Laboratory, Faculty of Agriculture, Padjadjaran University. This experiment factorial randomized block design consisting of two factors., concentration of Prohexadione-Ca which includes three levels (50, 100, and 150 ppm) application time of Prohexadione-Ca (30, 40, and 50 days after planting). The experimental results showed that there was an independent effect between the dose and time of application of Prohexadione-Ca on the physiological components, yield, and quality of results. The dose of Prohexadione-Ca 50 ppm independently gave the best effect on the chlorophyll content index and stomatal conductance. The time of application of Prohexadione-Ca 40 days after planting independently gave the best effect on the number of potatoes per plant, potato weight per plant, and shoot length.

Corn is one of the strategic food commodities in Indonesia which is currently widely used as animal feed ingredient. But the average productivity of national corn is still low. This study aims to determine the dose of herbicide ammonium glufosinate 200 g/L which can maintain the growth potential and yield of corn plants. The experiment was carried out at the Ciparanje Experimental Garden of the Faculty of Agriculture, Padjadjaran University, Jatinangor, Sumedang Regency, West Java, with altitude of 750 meters above sea level in November 2017 to March 2018. The experimental method used was a randomized block design consisting of seven treatments which were repeated four times. The treatments tested consisted of: manual weeding, application of different doses of ammonium glufosinate (450, 600, 750, 900, and 1050 g/ha) and unweeded check. The results of the experiment showed that application of ammonium glufosinate 200 g/L herbicide is able to suppress weed growth in corn cultivation. The application of ammonium glufosinate 200 g/L herbicide starting from a dose of 600 g/ha is effective in suppressing weed growth and suppressing the loss of yield of corn due to the presence of weeds.

Sari. Rendahnya produktivitas kelapa sawit salah satunya disebabkan oleh adanya kompetisi tanaman dengan gulma. Pengendalian gulma dengan herbisida kalium glifosat 660 g/L sudah banyak dilakukan dan dinilai efektif. Hambatan yang terjadi yaitu terkadang turun hujan setelah aplikasi herbisida yang menyebabkan efikasi kurang efektif. Penelitian ini bertujuan untuk mengetahui ketahanan herbisida kalium glifosat 660 g/L akibat pencucian air hujan dalam mengendalikan gulma dominan pada tanaman kelapa sawit. Penelitian dilaksanakan di Rumah Kaca Fakultas Pertanian Universitas Padjadjaran Jatinangor pada bulan Februari sampai bulan April 2018. Rancangan yang digunakan dalam penelitian ini yaitu Rancangan Acak Kelompok yang terdiri dari 7 perlakuan dan 4 ulangan. Perlakuan yang diberikan adalah waktu turun hujan setelah aplikasi herbisida kalium glifosat 660 g/L, yang terdiri dari 0, 1, 2, 3, dan 4 jam setelah aplikasi, tanpa hujan, serta tanpa aplikasi herbisida. Perlakuan diterapkan pada 6 jenis gulma, yaitu Asystasia intrusa, Imperata cylindrica, Borreria alata, Ageratum conyzoides, Paspalum conjugatum dan Setaria plicata. Hasil percobaan menunjukkan bahwa herbisida kalium glifosat 660 g/L mampu mengendalikan 5 jenis gulma yaitu I. cylindrica, A. conyzoides,  S. plicata (persentase kerusakan masing-masing 100%); B. alata (persentase kerusakan 90 – 100%); dan P. conjugatum (persentase kerusakan 51,5 – 100%); secara efektif walaupun tercuci air hujan antara 2 – 4 jam setelah aplikasi. Herbisida kalium glifosat 660 g/L mampu mengendalikan gulma I. cylindrica (persentase kerusakan 79,6%); B. alata, dan A. conyzoides (persentase kerusakan masing-masing 100%); dengan rentang waktu kurang dari 2 jam setelah aplikasi sebelum tercuci air hujan. Kata kunci: Kelapa Sawit, gulma dominan, Kalium glifosat 660 g/L, turun hujan

Abstract. The low productivity of oil palm is caused by competition between crop with weeds. Weed control with potassium glyphosate 660 g.L^-1 herbicide has been done and is considered effective. Rainfall after herbicide application can be a problem because efficacy can be less effective. This study aims to determine the effect of rainfall on effectivity of potassium glyphosate 660 g.L^-1 herbicide in controlling the dominant weeds of oil palm. The study was carried out at the Ciparanje Experimental Greenhouse, Faculty of Agriculture, Padjadjaran University, from February to April 2018. The experimental design used Randomized Block Design, that consisted of 7 treatments and 4 replications. The treatments were the time of rainfall after application of potassium glyphosate 660 g.L^-1 herbicide. It consisted of 0, 1, 2, 3, and 4 hours after herbicide application, without rainfall, and without herbicide application. The treatment was applied to 6 types of weeds. There were Asystasia intrusa, Imperata cylindrica, Borreria alata, Ageratum conyzoides, Paspalum conjugatum, and Setaria plicata. The experimental results showed that potassium glyphosate 660 g.L^-1 was able to control 5 types of weeds. There were I. cylindrica, A. conyzoides, S. plicata (each percentage of damage was 100%); B. alata (90-100% damage percentage); P. conjugatum (51.5 – 100% damage percentage); was controlled in rainfall at 2 – 4 hours after herbicide application. Potassium glyphosate 660 g.L^-1 herbicide controlled I. cylindrica (79.6% damage percentage); B. Alata and A. conyzoides (each percentage of damage was 100%); in rainfall at less than 2 hours after herbicide application. Keyword: Palm oil, Dominant Weed, Potasium Glyphosate, Rainfall

Straw mushroom turns out to be the leading commodities in Karawang Regency in Indonesia. This district has been called as the highest production district/city in West Java besides West Bandung, Bogor, Subang and Cianjur. The demand for straw mushrooms is always increasing every year. However, still, there are some risks in mushroom supply chain. This study aims at identifying the actors involved and recognizing the types of risks in the straw mushroom supply chain. The respondents used in this study are experts consisting of government representatives, academic representatives, and practitioners involved in the mushroom supply chain. The research method used is descriptive method with survey research techniques. The data used are primary and secondary data. The sample was determined by purposive sampling with consideration of expertise. The analytical method used is Analytical Hierarchy Process (AHP) model; it is used to identify the types of risks in the straw mushroom supply chain. The results demonstrated that there were five actors involved in the six supply chain channel patterns covering farmers, dealers, wholesalers, retailers, and consumers. The AHP model indicates that production risk (16.3%) is the major risk and needs more attention, and then followed by price risk (14.4%), quality risk (12.3%), capital risk (10.3%) and market risk (10.1%).

Published in International Journal of Botany Studies

Penambahan surfaktan diduga dapat mengoptimalkan pengendalian gulma menggunakan herbisida. Penelitian ini bertujuan untuk mengetahui pengaruh jenis dan konsentrasi surfaktan pada pengendalian kimia menggunakan herbisida Glufosinat terhadap gulma di pertanaman jagung (Zea mays L.). Penelitian ini dilakukan dari bulan September sampai dengan Desember 2016 di Kebun Percobaan Ciparanje Unpad. Rancangan perlakuan yang digunakan adalah Rancangan Acak Kelompok (RAK) dengan 9 perlakuan yaitu : Glufosinate + surfaktan nonionik 15% ; Glufosinate + surfaktan anionik 15% ; Glufosinate + surfaktan kationik 15% ; Glufosinate ; Glufosinate + surfaktan nonionik 20% ; Glufosinate + surfaktan anionik 20% ; Glufosinate + surfaktan kationik 20% ; Penyiangan Mekanis ; Kontrol (tanpa perlakuan) ; diulang 3 kali untuk setiap perlakuan. Perbedaan antar perlakuan diuji dengan menggunakan uji F, sedangkan menguji perbedaan nilai rata-rata perlakuan digunakan uji Duncan pada taraf nyata 5%. Hasil penelitian menunjukkan bahwa perlakuan Glufosinat tanpa surfaktan dapat menekan pertumbuhan gulma sehingga menunjukkan hasil tanaman terbaik dengan bobot rata-rata sebesar 12,41 ton/ha pipilan kering. Kata Kunci : jagung, glufosinat, surfaktan