Lihat Juga

• Yield stability and adaptability of aromatic New Plant Type (NPT) rice lines
  oleh: Lestari, Angelita Puji, et al.
  Terbitan: (2011)
• Aromatic new plant type (NPT) rice lines were selected to obtain high yielding and aromatic lines. The objectives of the research were to study the yield stability and adaptability of 35 NPT rice lines across different environment, with Ciherang and Sintanur as check varieties. The lines planted at two locations, Bogor and Pusakanagara in two seasons (2009 dry and wet seasons, DS-WS). The experiment used randomized complete block design (RCBD), with three replications. The 21-day-old seedlings were planted with spacing of 20 cm x 20 cm, with a plot size of 2 m x 5 m. Yield stability and adaptability were estimated by using coefficient regression (bi) and general mean of yield by Finlay-Wilkinson method. Combined analysis of variance showed that lines (G), environment (E), and the G x E interaction were significantly different. Lines showed different stability and adaptability. Several lines yielded higher than Ciherang variety. Nine lines were classified as stable and widely adapted at the marginal environment, i.e IPB 116-F-3-1, IPB 117-F-4-1, IPB-117-F-14-2, IPB-117-F-15-2, IPB-117-F-17-5, IPB 140-F-1-1, 140-F-IPB, 2-1, IPB 140-F-3, and IPB 149-F-2. Lines IPB 113-F-2, IPB 140-F-4, IPB 140-F-6, IPB 140-F-7, and B11738-MR-Si-1-2-1-2 were not stable and adapted only in optimum environmental condition (bi > 1) while IPB 116-F-46-1, IPB-117-F 17-4, IPB-117-F 18-3 and B11955-MR-84-1-4 has the value of bi < 1 or adaptable to marginal environments. Keywords: NPT rice, aromatic rice, yield stability
  oleh: Lestari, Angelita Puji; Indonesian Center for Rice Research (ICRR), Jl. Raya Ciapus No. 25A Bogor
• This research was aimed to study the effect of stem and primary branch prunning on photosynthetic rate and production of physic nut. The experiment was conducted in IPB experimental station in Cikabayan, Darmaga, Bogor, from February 2007 until May 2008. A randomized block design with one factor was used in the experiment. The treatments were combination between stem pruning with various height from the soil surface and pruning of primary branches with various number of branch remained. Stem pruning on 40 cm above the soil surface with no branch pruning resulted in the highest photosynthetic rate (8.10 μmol CO2 m-2 s-1), while stem pruning on 20 cm above the soil surface with 2 primary branches remained resulted in the lowest photosynthetic rate (4.71 μmol CO2 m-2 s-1). Stem pruning on 40 cm above the soil surface without branch pruning produced the highest yield components, i.e., capsul number (207.3 capsul plant-1), seed number (506 seeds plant-1) and seed dry weight (323.81 g plant-1). Keywords: photosynthetic rate, production, stem prunning
  oleh: Hariyadi, ,; Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University, Jl. Meranti, Kampus IPB Darmaga 16680, Indonesia
• Non Paramectric Stability Analysis for Yield of Hybrid Chili Pepper (Capsicum annuum L.) Across Six Different Environments
  oleh: Syukur, Muhamad; Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University Jl. Meranti, Kampus IPB Darmaga, Bogor 16680, Indonesia, et al.
  Terbitan: (2014)
• Yard long bean (Vigna unguilata L.) 777 was grown in Ultisols, which typically have low pH and high P-fixation, to determine the best correlation of soil extraction methods for soil P with yields, and to develop soil P response categories. The research was conducted at SANREM base camp in Hambaro Village, Nanggung, Bogor, Indonesia from April-August 2008. Treatments were arranged in a Split Plot Design with three replications. The main plots were treatments with soil P status of 0X, 1⁄4X, 1⁄2X, 3⁄4X and X, where is X = 1,590.5 kg SP-36 ha-1 (36% P2O5) applied once a month before planting. The subplots were P application rate of 0, 75, 150, 225 and 300 kg P2O5 ha-1. Yard long beans were planted in double rows per bed, 60 cm between rows and 25 cm within rows, 2 seeds per hole, with plot size of 1.5 m x 5 m. Coefficient correlation (r) of extraction reagents Olsen, Bray-1, HCl 25%, and Mechlich-1 were 0.772, 0.765, 0.755, and 0.732, respectively. Based on Olsen soil testing methods, soil response categories of very low, low, medium, and high were (ppm P2O5) ≤ 18.40, 18.40 < P < 117.27, 117.27 < P < 267.04, and ≥ 267.04 extracted-P, respectively. Based on Bray-1 soil testing methods, soil response categories for low, medium, and high were ≤ 87.81, 87.812O5), respectively. Fertilizer recommendation based on the Olsen soil test for low response category was 185.75 kg P2O5 ha-1, and for the medium soil category was 175.97 kg P2O5 ha-1. The Bray-1 soil test for the low response category was 184.31 kg P2O5 ha-1, and for the medium soil category was 161.39 kg P2O5 ha-1. Keywords: fertilizer recommendation, calibration, phosphorus, yard long bean
  oleh: Susila, Anas Dinurrohman; Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University, Jl. Meranti Kampus IPB Darmaga 16680, Indonesia