Study of agroforestry plant pattern as expedient to promote settle farming of dryland in Tumbang Samba village, Kotawaringin Timur regency of Central Kalimantan [Indonesia]
1997
Winarti, S. | Lambung, M.R. | Birawa, C. (Universitas Palangkaraya (Indonesia). Fakultas Pertanian)
The experiment to find out plant combination which produce better plants growth and yield, and also to find change-over of the soil chemistry. The experiment uses Split Plot Design with three replications. The growth and diameter of nangka's trunk which monoculture planted is higher than multicroped with sengon, that are 51.19 cm and 7.56 mm. Combination of rice + soybean, lead to increase significantly the diameter of nangka that is 7.44 mm. Nangka which is restricted by sengon and corn, its growth in inhibited. The highest dry biomass is 8135.4 kg/ha from nangka + sengon treatment. The treatment which consist of sengon tend to produce higher biomass, that is 7083.3-8416.7 kg/ha. The corn + soybean treatment, produce highest yield (rice, corn-soybean) that is Rp. 6.887.000,00/ha (conversion from the yield of corn 7155.1 kg/ha and soybean 1489.8 kg/ha). According to the time dimension, soil chemistry reduction, occur for base saturation, P-available, K+, Ca+, Mg+, Na+, Al+, Al- saturation, H+ and Fe+3. For soil chemistry characteristics changes before and after experiment, nangka's treatment increase significantly CEC (14.02 me/100 g), decrease of K+ become 13.68 me/100 g, and decline Al saturation (20.14 percent). Rice + soybean combination, produce highest N-total value 0.67 percent. Nangka + sengon - soybean + rice combination contribute decline in lowest value of Ca+, Mg+, and Na+, ie. 1.30, 1.09 and 3.25 me/100 g respectively. However this treatment has given smallest increase Fe+3, ie. 17.2 ppm
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