Abstract
<p class="abstrak2">Oil palm estate area in Indonesia is generally located in a sub-optimal land that has great opportunity for the development of forage supply. This study aims were to determine productivity of <em>Indigofera</em> zollingeriana under various canopy level. This research used factorial randomized block design with 3 canopy levels (under 2, 5, and 7 year oil palm canopy) and 2 levels of soil acidity (neutral and acid soil) treatments, where each treatment was repeated 4 times. Parameters observed were production and nutrient content of <em>Indigofera</em> zollingeriana. Research results showed that there was no interaction between the canopy levels and soil acidity on the production of fresh leaves, stems/branches, biomass, and leaves/stem ratio of I. zollingeriana. Production of fresh leaves, stems, biomass, and leaves/branches ratio of <em>I. </em>zollingeriana significantly (P &lt;0.01) decreased along with increase of canopy level. Soil acidity significantly (P &lt;0.05) decreased production of fresh leaves, stems, biomass, and leaves/branches ratio. Level of canopy treatment significantly (P &lt;0.05) increased content of crude protein, crude fiber and energy, otherwise value of in vitro dry matter digestibility (IVDMD) and organic matter digestibilyity (IVOMD) were decrease. Soil acidity significantly (P &lt;0.05) decreased calcium content, in vitro dry matter digestibility (IVDMD) and organic matter digestibility (IVOMD) of <em>I. </em>zollingeriana.</p>
Highlights
Limited forage land in Indonesia is caused by several factors such as limited land availability, competition with other use, and high land convertion number
Atman (2006) reported that most of total area available in Indonesia (190,946,500 ha) for agriculture area were clasified as Ultisol or acidic dryland
This study was conducted in oil palm estate in Deli Serdang district, North Sumatra by planting I. zollingeriana as an intercropping plant
Summary
Limited forage land in Indonesia is caused by several factors such as limited land availability, competition with other use, and high land convertion number. Mulyani et al (2011) said that most of the remaining land for forthcoming agricultural development was sub-optimal or marjinal land, such as rainfed land; acidic dryland and wetland with various biosfic issues. Atman (2006) reported that most of total area available in Indonesia (190,946,500 ha) for agriculture area were clasified as Ultisol or acidic dryland. Limited forage land in Indonesia is caused by several factors such as limited land availability, competition with other use, and high land convertion number. Mulyani et al (2011) said that most of the remaining land for forthcoming agricultural development was sub-optimal or marjinal land, such as rainfed land; acidic dryland and wetland with various biosfic issues. Atman (2006) reported that most of total area available in Indonesia (190,946,500 ha) for agriculture area were clasified as Ultisol or acidic dryland. Ultisol soil was drysoil with high abiotic stresses, such as soil pH
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