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Pengaruh Konsentrasi Besi dalam Larutan Hara terhadap Gejala Keracunan Besi dan Pertumbuhan Tanaman Padi Noor, Aidi; Lubis, Iskandar; Ghulamahdi, Munif; Chozin, Muhammad Achmad; Anwar, Khairil; Wirnas, Desta
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 40, No 2 (2012): JURNAL AGONOMI INDONESIA
Publisher : Bogor Agricultural University

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Abstract

Iron (Fe) toxicity is a major constraint in rice production that decreases yield due to high level of soluble Fe. The aims of this experiement were to study the effect of particular Fe concentrations in nutrient solution on rice growth, and to determine Fe concentration in nutrient solution that caused light, moderate, and severe Fe toxiciy symptom. The experiment was conducted in a greenhouse, Bogor Agricultural University from May to July 2010. A randomized block design with two factors and three replications were used in this study. The first factor was Fe concentration in the medium solution (2, 50, 100, 200, 400, 600 ppm Fe), and second factor was rice genotypes (IR64, Margasari). The results showed the higher Fe concentration in the solution resulted in higher scores of iron toxicity symptoms, higher Fe levels in the plant, and caused stunted growth of rice plants. Levels of Fe in a solution of ≥ 200 ppm Fe inhibited plant growth. Iron toxicity symptom in Margasari was lower than the IR64 varieties, especially at concentrations of 200 and 400 ppm. According to the regression equation Y = 0.022X+ 1849, Fe concentration in the solution which caused light Fe toxicity symptom (score ≤ 3) was ≤ 52 ppm Fe, moderate (score = 5) was 143 ppm Fe, heavy (score = 7) was 234 ppm Fe, and severe (score ≥ 9) was ≥ 325 ppm Fe. Keywords: iron toxicity symptoms, iron concentration, rice
The effect of mixed cultivars plantings on pest abundance and grain yields in rice Dewi, Azri Kusuma; Triwidodo, Hermanu; Chozin, Muhammad Achmad; Aswidinnoor, Hajrial
Jurnal Entomologi Indonesia Vol 15, No 2 (2018): July
Publisher : Perhimpunan Entomologi Indonesia

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Abstract

Penelitian lapang telah dilakukan untuk mengkaji pengaruh percampuran kultivar padi sawah terhadap kelimpahan hama dan hasil gabah. Peningkatan keragaman spesies tanaman melalui percampuran kultivar sering diklaim berdampak positif untuk mengurangi masalah hama sekaligus menstabilkan atau bahkan meningkatkan hasil, tetapi efek percampuran kultivar padi terhadap kejadian hama di Indonesia belum banyak dipelajari. Kami menguji perubahan kelimpahan hama dalam plot percobaan yang ditanami lima kultivar padi yang berbeda secara genetik, dikombinasikan dalam dua pola pengaturan campuran yang berbeda (seed mix dan row mix). Campuran ini ditanam di area sawah dalam bentuk rancangan acak lengkap berulang selama dua musim tanam. Kelimpahan hama di semua plot pengujian diukur setiap minggu dan hasil gabah pada saat panen. Hasilnya menunjukkan bahwa rerata kelimpahan hama menurun pada plot yang ditanami oleh campuran kultivar dibandingkan dengan plot yang ditanami oleh tanaman tunggal dari masing-masing komponen kultivar. Plot dengan penanaman seed mix konsisten terhadap penurunan hama wereng coklat dikedua musim tanam, dengan penurunan relatif kelimpahan hama adalah masing-masing 29,83% pada musim pertama dan 6,61% pada musim kedua dibandingkan dengan monokultur. Plot dengan penanaman row mix konsisten terhadap penurunan relatif penggerek batang dalam campuran, yaitu masing-masing 100% pada musim pertama dan 1,4% pada musim kedua dibandingkan dengan monokultur. Dalam hal hasil, tinggi tanaman adalah karakter komponen hasil yang konsisten menunjukkan efek positif pada kedua tipe campuran di dua musim tanam. Dari penelitian juga menunjukkan hasil rata-rata lebih tinggi untuk plot genotipe campuran dibandingkan dengan genotipe murni pada musim tanam 2013. Peningkatan relatif hasil gabah dalam pengujian seed mix lebih baik dibandingkan dengan row mix berturut-turut, yaitu 7,26% pada seed mix dan 4,63% pada row mix, pada  musim tanam 2013. Diantara kedua tipe campuran, seed mix menunjukkan hasil yang lebih baik. Hasil penelitian ini menyarankan pada petani untuk meningkatkan hasil dan menurunkan kelimpahan hama melalui percampuran kultivar.
The Effect of Population Density and Intercropping with Tomato on the Growth and Yield of Winged Bean (Psophocarpus tetragonolobus) Maure, Gerson Hans; Chozin, Muhammad Achmad; Santosa, Edi
Journal of Tropical Crop Science Vol 6 No 02 (2019): Journal of Tropical Crop Science
Publisher : Journal of Tropical Crop Science

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Abstract

Winged bean (Fabaceae) is a tropical crop that has high nutrient content, and almost all parts of the plant are edible. The research aimed to evaluate the growth and production of winged bean in an intercropping system with tomato. The study was conducted at the Cikabayan Experimental Field of Bogor Agricultural University, Bogor, Indonesia, in a randomized block design with three replications during the rainy season of December 2017 to June 2018. Winged beans were planted in high and low population densities and intercropped with three tomato genotypes, “Tora”, F70030081-12-16-3 and “Apel Belgia”. Monoculture winged bean was assigned as control. Tomatoes were planted between the rows of the winged beans in the intercropping treatment. The results showed that the growth of winged bean in monoculture and intercropping systems was not significantly different. The photosynthetic activity of winged bean at three to five weeks after planting remained high, indicating that the vegetative growth was optimal in both systems. Intercropping increased the winged bean number of pods per plant by 12.66-19.52% compared to monoculture, irrespective of population density. Therefore, winged bean could be considered as suitable to grow in intercropping systems.