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NISBAH HARA MIKRO TERHADAP KALIUM DAUN BEBERAPA VARIETAS PADI (Oryza sativa L.) PADA DUA JENIS TANAH Yustisia Yustisia; Tohari Tohari; Dja’far Shiddieq; Subowo G.
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Pot experiment was conducted at the experimental farm of Agriculture Faculty, Gadjah Mada University, Yogyakarta and aimed to investigate the effect of soil types, varieties and and their interaction on Fe/K, Mn/K, Cu/K and Zn/K leaf, growth, leaf protein and grain yield of rice. The experiment was set up in a 2 x 6 factorial pat- tern randomized completely block design with three replications. First factor was two soil types viz. Vertisols and Inceptisols, second factor was rice varieties viz. Cimelati, Pandan Wangi, Ciherang, Cisokan, Widas and IR 64. The result revealed that the Fe/K, Cu/K and Zn/K ratios in rice leaf was significantly affected by soil types and rice varieties. The interaction of soil and rice varieties significantly affected the leaf ratios of Fe/K, Cu/K and Zn/K, crop growth rate (CGR) and grain yield, but it was not significantly affect the Mn/K ratio and leaf protein. The leaf ratios of Fe/K, Cu/K and Zn/K, CGR and grain yield in Vertisols were significantly higher than those in Inceptisols, while Mn/K ratio and leaf protein was significantly higher in Inceptisols. The highest of grain yield was achieved by Pandan Wangi whereas the lowest of grain yield was achieved by IR 64. The lowest of grain yield was achieved by IR 64 in Inceptisols. It was affected by an imbalance of Mn/K ratio and highest of leaf protein. It could be due to the effect of Inceptisols native soil properties (lower pH, higher Mn and K) and specific characteristics of IR 64 (more responsive to low pH, higher NH + uptake). It was also may be caused by indirect effect of urea excess and KCl fertilizers on reducing of rhizosphere pH. The Mn/K ratio was important nutrient imbalance in Inceptisols soil and rice plant. The finding of this study suggests that the research in depth which is focused on Mn/K ratio balance in Inceptisols is needed, i.e using urea and KCl application in proper rate, using another source of nitrogen and potassium fertilizers, and using specific of varieties (less responsive to NH + and more responsive to NO -).

NISBAH HARA MIKRO TERHADAP KALIUM DAUN BEBERAPA VARIETAS PADI (Oryza sativa L.) PADA DUA JENIS TANAH Yustisia Yustisia; Tohari Tohari; Dja’far Shiddieq; Subowo G.
Widyariset Vol 17, No 2 (2014): Widyariset
Publisher : Pusbindiklat - LIPI

Pot experiment was conducted at the experimental farm of Agriculture Faculty, Gadjah Mada University, Yogyakarta and aimed to investigate the effect of soil types, varieties and and their interaction on Fe/K, Mn/K, Cu/K and Zn/K leaf, growth, leaf protein and grain yield of rice. The experiment was set up in a 2 x 6 factorial pat- tern randomized completely block design with three replications. First factor was two soil types viz. Vertisols and Inceptisols, second factor was rice varieties viz. Cimelati, Pandan Wangi, Ciherang, Cisokan, Widas and IR 64. The result revealed that the Fe/K, Cu/K and Zn/K ratios in rice leaf was significantly affected by soil types and rice varieties. The interaction of soil and rice varieties significantly affected the leaf ratios of Fe/K, Cu/K and Zn/K, crop growth rate (CGR) and grain yield, but it was not significantly affect the Mn/K ratio and leaf protein. The leaf ratios of Fe/K, Cu/K and Zn/K, CGR and grain yield in Vertisols were significantly higher than those in Inceptisols, while Mn/K ratio and leaf protein was significantly higher in Inceptisols. The highest of grain yield was achieved by Pandan Wangi whereas the lowest of grain yield was achieved by IR 64. The lowest of grain yield was achieved by IR 64 in Inceptisols. It was affected by an imbalance of Mn/K ratio and highest of leaf protein. It could be due to the effect of Inceptisols native soil properties (lower pH, higher Mn and K) and specific characteristics of IR 64 (more responsive to low pH, higher NH + uptake). It was also may be caused by indirect effect of urea excess and KCl fertilizers on reducing of rhizosphere pH. The Mn/K ratio was important nutrient imbalance in Inceptisols soil and rice plant. The finding of this study suggests that the research in depth which is focused on Mn/K ratio balance in Inceptisols is needed, i.e using urea and KCl application in proper rate, using another source of nitrogen and potassium fertilizers, and using specific of varieties (less responsive to NH + and more responsive to NO -).

PERANAN POHON PELINDUNG DALAM MENENTUKAN PRODUKTIVITAS KOPI Rusdi Evizal; Tohari Tohari; Irfan Dwija Prijambada; Jaka Widada
JURNAL AGROTROPIKA Vol 17, No 1 (2012): Agrotropika Vol.17 No.1 2012
Publisher : Universitas Lampung

Shade trees of legume in par-ticular have ecological function such as litter fall production, N fixation, nutrient acquisition from deep soil, and shade provision. Shade trees may influence coffee bean yield both increasing and decreasing the yield. To evaluate the role of shade trees in determining coffee yield, the experimental plots were constructed at benchmark site of Conservation and Sustainable Management of Below-Ground Biodiversity (CSM-BGBD), in Sumberjaya Subdistrict, West Lampung, Indonesia. Shade trees of Coffea canephora agro-ecosystems to be examined were Gliricidae sepium, Erythrina sububrams, Michelia champaca, and no shade. The results showed that agro-ecosystem shaded with Gliricidae sepium, Erythrina sububrams, Michelia champaca gave positive return of N, P, K. Total N from litter fall of shade trees and level of shading had quadratic regression with coffee yield. Shading on July significantly determined coffee yield with negative coefficient. Key words: shade tree, coffee yield, litter fall, level of shading

RESPON TANAMAN JAGUNG TUMPANGSARI KACANG HIJAU TERHADAP PERLAKUAN PARIT PADA LAHAN KERING Edy Edy; Tohari Tohari; Didik Indradewa; Dja’far Shiddieq
JURNAL AGROTROPIKA Vol 16, No 1 (2011): Agrotropika Vol.16 No.1 2011
Publisher : Universitas Lampung

Water management in rainfed drylands are very important to consider. Limited water on dry land can be anticipated with rain harvesting technologies such as by making the trench. To further optimize land with soil moisture, maize intercropping with mungbean. This study aims to determine the effectiveness of trench system with intercropping maize with mungbean. The research was conducted in Village of Wareng, sub District of Wonosari District of Gunungkidul Province of D.I. Yogyakarta, during November 2010 until February 2011. This study was designed using the Randomized Split Plot. The main plot is a trench system consists of three types: Without a trench (Control, P0), the Trench (P1), the Trenches+organic material (P2). Subplot is the cropping pattern consists of two types: Corn monoculture (J) and mungbean intercropping maize (J + H). Maize tested were Bima-2 Bantimurung varieties most resistant to drought conditions based on previous research. The results showed that the combination of trench + organic materials and intercropping patterns can increase maize leaf area index about 40%. The yield obtained maize intercropped with mungbean on the treatment of trench + organic materials with about 6.258 ton ha-1 of corn and 0.418 ton ha-1 of mungbean while in the trench treatment without organic material 4.829 t.ha-1 of corn and mungbean 0.369 ton ha-1. Efficiency of water use in intercropping maize and mungbean increased about 60.8%; Intercropping maize and mungbean in the treatment of trench + organic materials and trench without organic material increased the land equal ratio about 76.05% and 40.70% respectively. Key words: trench, intercropping, maize, mungbean, dryland.

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