• This email address is being protected from spambots. You need JavaScript enabled to view it.
  • (0911) 322664

Pengujian Efektivitas Pupuk SRF-N Jenis D dan H Terhadap Pertumbuhan Dan Hasil Tanaman Padi Sawah Di Kelurahan Dua Limpoe, Kabupaten Wajo, Sulawesi Selatan

Study of the effectiveness of Slow Release Fertilizer (SRF) was conducted in Dua Limpoe village, Maniang Pajo subdistrict, Wajo district during Dry Season 2008. The aim was to know the effectiveness level of SRF-N (D & H) on growth and yield of lowland rice, and to obtain the fertilizer dosage of SRF-N (D & H) that gave the highest yield of lowland rice. Twelve treatments of SRF-N (D & H) were applied, in addition to recommendation dosage factor and farmer's way. The experiment was arranged in a Randomized Block Design with three replications. Result of assessment indicated that SRF-N (D and H) significantly affected the growth and yield of lowland rice. Application of SRF-N type H with dosage 350 kg ha-I (two times applications), combined with SP-36 and KC1, 75 kg and 50 kg ha-1 respectively gave higher dry milled grain (7.43 t DMG ha-I ) compared to other treatments of SRF, followed by SRF-H 280 kg and SRF-D 500 kg ha-I (2 times application) combined with recommendation dosage of P and K, 7.17 t and 7.15 t DMG ha-1. Treatment of farmer's way with dosage of Urea 300 kg, SP-36 100 kg ha-1, and KCI50 kg ha-1, gave highest dry milled grain (8.14 t DMG ha-1) compared to other treatments including recommendation dosage (7.65 t DMG ha-I ). Effectiveness of SRF-N type H with dosage 350 kg (two times applications) plus 75 kg SP-36 and 50 kg KCl ha-1 on grain yield was 0.97 times compared to recommendation. There was a need to study more ofSRF-H 350 kg and 280 kg ha-1, and SRF-H 500 kg ha-I (2 times application), combined with P and K recommendation on different location and planting season to obtain accurate data in order to provide the specific location fertilizer recommendation. (Jurnal Budidaya Pertanian, v. 8(2) 2013 p. 76-82)

Diallel analysis of cocoa (Theobroma cacao L) resistance to phytophthora palmivora in Indonesia

For the program towards the development of resistant cacao (Theobroma cacao L.) to the black pod rots disease caused by P palmivora, the diallel crossing analysis is expected can be used to provide genetic parameters on quantitative traits. The objective of the present study was to determine genetic parameters of cacao resistance to the disease caused by P palmivora, using half diallel crosses. The crosses used five cocoa clones as parental clones (ICCRI 3, TSH 858, DR 1, ICS 13. and Sca 6) having resistance levels from susceptible to resistant. The experiment was aranged in a Randomized Block Design with three replications. The treatments were 10 hybrids (F1) and 5 parental clones. Observation was conducted 3 days after inoculation to the spot area caused by P palmivora infection. The results showed that there was no interaction between genes in determining the resistance to black pod rots disease caused by P palmivora. The resistance was more affected by the additive gene action. Characters of resistant to the disease were controlled by the recessive genes. The results in the present study also showed that the dominant genes were more in the parents. It is expccted that the opportunity to produce cocoa hybrid owned by JCCRI 3 and Sca 6.Furthermore, the estimated value of broad sense heritability (h2BS) and narrow sense heritability (h2NS) was high for the spot area. whilc, based on the disease intensity it was moderate to high. (Jurnal of Biologi, Agriculture and Healthcare, v. 3(3) 2013 p. 76-83)

Influence of flooding levels on changes in C, N nd weight of rice straw in paddy soil

It is imperative to have a better understanding of the effects of different flooding levels in paddy soils on changes in soil chemical properties, especially information on the N recovery and N mineralization when the rice straw is incorporated into soil as a source of soil organic matter under tropic conditions, such as in Metro, Lampung. A glasshouse study was carried out to determine the effects of different flooding levels (2.5, 5.0, 7.5, and 10.0 cm) on changes in carbon (C), nitrogen (N) contents and weight of rice straw incorporated into paddy soil. The treatments were arranged in a completely randomized block design with six replications. The results showed that C content of the rice straw at the beginning of the trial was 33-40 percent. These values decreased 2 weeks after flooding except for the flooding level of 10 cm the C content still decreased until 4 weeks after flooding. And then for all flooding levels the values tended to return to the initial values 8 weeks after flooding. Meanwhile, the N content at the beginning of the trial was 0.56-0.60 percent. The N contents for all flooding levels increased with increasing time of observation (1.34-1.48 percent). The C:N ratios for all flooding levels at the beginning of the trial greatly decreased until 2 weeks after flooding. Thereafter, the ratios decreased slightly until 8 weeks after flooding. Furthermore, flooding level of 2.5 cm gave the lowest weight of rice straw 8 weeks after flooding, whereas, flooding level of 10.0 cm gave the highest weight of rice straw, suggesting that the lesser the flooding level, the faster the litter decomposition rate. This confirms other findings that at the depth of 1-2 cm below water surface of a paddy field are all aerobic zone, where the litter decomposed most rapidly. (Journal of Biology, Agriculture and Healthcare, v. 3(5) 2013 p. 80-85)