Respons Varietas Padi IR64 dan IR64 Sub-1 Akibat Pengaruh Perendaman dan Pemupukan
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Date
2010-11-18
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Balai Besar Penelitian Tanaman Padi
Abstract
Abstract
Response of IR64 and IR64 Sub-1 Rice Varieties to Submergence and Fertilizers. A number of rice varieties were produced, introduced, and bred, either by IRRI and by NARs that were tolerant to submergence condition. Among them were IR6-4 Sub-1. Swarna Sub-1, Inpara 1, Inpara 2, Inpara 3, and others. However, the performance of those new varieties in this particular ecosystem have not been widely evaluated yet. Experiment to evaluate the response of IR64 and IR64 Sub-1 to submergence and fertilizers was conducted in the green house of Muara Experimental Station of the Indonesian Center for Rice Research, during the dry season of 2008. The objectives of this experiment were (1) to study the effects of time of exposure to submergence and nitrogen application on plant growth and yields of IR64 and IR64 Sub-1 varieties; (2) to find the proper nutrient management for rice varieties grown under submergence condition. The experiment was arranged in a Complete Randomized Factorial Design with three replications. The rice varieties IR64 and IR64 Sub-1 were assigned as Factor 1. Times of exposure to submergence (without submergence, submerged at 15 to 24 DAT, and submerged at 35 to 45 DAT) were as Factor 2. and 5 combinations of fertilizers, namely 300 kg urea/ha with 3 x applications at 7, 30, and 55 DAT; urea mudball, 300 kg urea/ha applied once at 7 DAT, compost, compost and urea, urea and silikat were as Factor 3. The application of urea was split four times, at 0 (basal), 7, 30, and 55 DAT. Results of the experiments indicated that time of exposure to submergence and different combination of fertilizers increased dry grain weight of IR64 by 35.9 g and 29.9 g at vegetative and primordial growth stages, respectively. The same effects were also occurred on the variety of IR64 Sub-1, in which its grain weight increased by 32.6 g and 30.3 g at vegetative and primordial growth stages, respectively.
Abstrak
Penelitian respons varietas padi IR64 dan IR64 Sub-1 terhadap genangan dan kombinasi pupuk telah dilaksanakan di Kebun Percobaan Muara, Balai Besar Penelitian Tanaman Padi pada MK 2008. Penelitian diatur dalam Rancangan Faktorial Acak Kelompok dengan tiga ulangan. Faktor pertama adalah varietas IR64 dan IR64 Sub-1; faktor kedua, tanpa perendaman selama 10 hari (kontrol); perendaman fase végetatif pada umur tanaman antara 15-25 HST, dan perendaman fase primordia pada umur tanaman antara 35-45 HST. Faktor ketiga, 5 kombinasi pemberian pupuk, yaitu urea pril, urea granul, kompos, kompos+ urea, dan urea + silikat. Pupuk N diberikan empat kali, yaitu pada 0 HST (dasar), 7 HST, 30 HST, dan 55 HST. Hasil penelitian menunjukkan bahwa bobot gabah varietas IR64 dan IR64 Sub-1 dengan perlakuan pemupukan dan perendaman pada fase vegetatif, naik berturut-turut sebesar 35,9 g dan 29,9 g, sedangkan untuk pemupukan dan penggenangan yang dilakukan pada fase primordia, bobot gabah kedua varietas yang diuji naik berturut-turut sebesar 32,6 g dan 30,3 g.
Description
13 p.; ills.; tab