Wandri, Ruli
Seminar Nasional Lahan Suboptimal

Published : 3 Documents
Articles

Found 3 Documents
Search

Performa Tanaman Kelapa Sawit pada Musim Kering di Sumatera Selatan; Pengaruh Defisit Air terhadap Fenologi Tanaman Agustiana, Sherly; Wandri, Ruli; Asmono, Dw
Seminar Nasional Lahan Suboptimal 2018: Prosiding Seminar Nasional Lahan Suboptimal "Tantangan dan Solusi Pengembangan PAJALE dan Kel
Publisher : Seminar Nasional Lahan Suboptimal

Show Abstract | Original Source | Check in Google Scholar | Full PDF (632.705 KB)

Abstract

Agustiana et al, 2019. Performance of Oil Palm in Dry Sesason in South Sumatera: Effect of Water Deficit on Plant Phenology. pp. 67-73.South Sumatra has a Monsoon type of rainfall that is a clear difference between the rainy and the dry season. Rainfall distribution cause successive dry months resulting in a water deficit. Water deficit can affect the performance of oil palm. The purpose of this study was to determine the phenology response of the appearance of midribs, male and female flowers to the variability of the season in South Sumatra. This study used a completely randomized design with 2 genotypes is Nigeria 3 and Nigeria 4 with 2 replications so that there were 4 units of experimental plots, where each plot consisted of 12 palms. Based on the results of observations it is known that plants that experience stress due to water deficit are indicated by the number of spear leaves> 4, and decrease of female flowers.
Performa Tanaman Kelapa Sawit pada Musim Kering di Sumatera Selatan: Pengaruh Pemupukan terhadap Pertumbuhan Vegetatif dan Status Hara Tanaman Prasetyo, Didik Wahyu; Kramajaya, M. Nur Fanani; Wandri, Ruli; Asmono, Dwi
Seminar Nasional Lahan Suboptimal 2018: Prosiding Seminar Nasional Lahan Suboptimal "Tantangan dan Solusi Pengembangan PAJALE dan Kel
Publisher : Seminar Nasional Lahan Suboptimal

Show Abstract | Original Source | Check in Google Scholar | Full PDF (650.324 KB)

Abstract

Prasetyo et al, 2019. Performance of Palm Oil in Dry Season in South Sumatera: Effect of Fertilizer on Vegetative Growth and Status of Nutrient. pp. 60-66.Most of the oil palm plantations in South Sumatra Province are planted in acid soils (Ultisol and Oxisol). The main limiting factor in acid soils is high acidity with low fertility. This condition is coupled with the typical climate conditions in South Sumatra, namely the existence of a strict boundary between the rainy and dry seasons. When the dry season, it is not uncommon to find water deficits. This study was conducted to determine the relationship between water deficit events and vegetative growth and nutrient content of oil palm. This study was carried out by exploiting data in fertilization experiments. Fertilization experiments using factorial design N3P2K3Mg2 (higher order partially confounded interactions) and each plot consisted of 64 trees. The results of the study showed that in general the water deficit events in 2014 decreased 4-6 frond per year in the same year and decreased 2-6 frond per year in 2015. Increased K content in the leaves will increase frond production. The optimum K content to maintain a fixed 24 frond production is 1.1%. This study can be used as initial information for management of fertilization management in the event of a water deficit.
Solubilisasi Fosfat Anorganik oleh Burkholderia spp. Pada Rizosfer Kelapa Sawit (Elaeis guineensis Jacq.) di Tanah Mineral Masam Nugraha, Gregorius Baskara Aji; Wandri, Ruli; Asmono, Dwi
Jurnal Lahan Suboptimal : Journal of Suboptimal Lands Vol 8, No 1 (2019): JLSO
Publisher : Pusat Unggulan Riset Pengembangan Lahan Suboptimal (PUR-PLSO) Universitas Sriwijaya

Show Abstract | Original Source | Check in Google Scholar | Full PDF (495.859 KB)

Abstract

Nugraha et al, 2019. Solubilization of Inorganic Phospate by Burkholderia spp. Associated with Oil Palm Rhizosphere in Mineral Acid Soil. JSLO 8(1):86-93.Phosphate Solubilizing Bacteria (PSB) play important role by enhancing phosphate availability bounded with Al3+ or  Fe3+ in acidic soils to oil palm plants through release the inorganic phosphate by enzyme or organic acids solubilization. The aims of this study were to isolate of PSB from oil palm rhizosphere and to conduct a comparative analysis of the solubility inorganic phosphates source by selected PSB. The ability of 15 selected PSB to grow and solubilize aluminum phosphate (AlPO4) and iron phosphate (FePO4) was examined and identified. The highest phospate solubilising efficiency showed K3.1 isolate with phosphate solubilization index 3.2 on NBRIP media. Quantitative analysis revealed that isolate K3.1 solubilized 53.52 mg/mL phosphate in 5 days after being inoculated in AlPO4 containing liquid medium, isolate A4 solubilized 63.45 mg/mL phosphate in 5 days after being inoculated in FePO4 containing liquid medium accompanied by a decrease in pH of the growth medium. Based on the 16s rRNA gene sequence analysis, isolate K3.1 and A.4 were closely related to Burkholderia arboris and Burkholderia gladioli. This potential isolates can be used in order to make oil palm crops more sustainable especially on marginal soil with low pH and less dependent on inorganic P fertilizers.