Pengaruh Penyaradan Kayu dengan Traktor Rantai Kelabang terhadap Kerusakan Tegakan Tinggal

The study of the effect of log skidding on the damage of residual stand was carried out in one logging company in West Kalimantan in 1986. The meaning of residual stand in the study are trees with diameter 20 cm and up. The result of the study shows that the average damage of residual stand is 18% per hectare, not included the damage caused by felling i.e. 15% per hectare. According lo Indonesian Selective Cutting System, the residual stand is good enough to fulfill the sustained yield condition, that is keep at least 25 core trees to be left per hectare. The role of skidded trees number and stand density was significant effect on the residual stand damage

NUTRIENT UPTAKE IMPROVEMENT OF FORAGE LEGUMES BY ROCK PHOPHATE FERTILIZATION AND ARBUSCULAR MYCORRHIZAL FUNGI INOCULATION

A series of experiments were carried out during 25 months consisting of greenhouse and field experiments and laboratory analysis. Centro (Centrosema pubescens) and puero (Pueraria phaseoloides) were inoculated with arbuscular mycorrhizal fungi (AMF) and without AMF and were fertilized with rock phosphate (RP) at dosage of completely randomized design (CRD) in three replicates was used for greenhouse experiment and in completely randomized block design (CRBD) was used for field experiment. The significant difference among treatments was tested using Duncan Multiple Range Tests (DMRT). The results of greenhouse experiment showed that N and P uptake of puero were higher than centro. Nitrogen and P uptake of mycorrhizal legumes were higher than non-mycorrhizal legumes. 0, 100, 200, 300 and 400 kg P2O5/ha. Split in time in Rock phosphate fertilization increased N and P uptake of mycorrhizal legumes approximately 9, and 22 times than non-mycorrhizal legumes respectively. The result of field experiment showed that N and P uptake of centro and puero Increased after defoliation. However, N and P uptake of puero were higher than centro. Rock phosphate fertilization increased N and P uptake of legumes. Nitrogen and P uptake of legumes were not significantly different for both with or without AMF inoculation

Pengaruh Penyaradan Kayu dengan Traktor Rantai Kelabang terhadap Penggeseran dan Pemadatan Tanah Hutan

The study of the effect of log skidding by crawler tractors on forest soil displacement and compaction wall carried out in one logging company in West Kalimantan in 1986. The results of the study are as the following :The average volume of soil displacement was 0.06 cu.m/m of skid road, it i6 equal to 0.061 ton/sq.m. This level of soil displacement iis higher than the soil loss tolerance of 0.0002 ton/sq.m.Soil compaction as indicated by the average soil bulk density is 0.16 g/cu.cm. At this level of compaction, the porosity is 56% (far higher than 10% minimum porosity), which means that the growth of vegetation will be still favourable.The role of soil water content and slope on forest soil displacement was positively significant. The role of skidding intensity on forest soil compaction was positively significant and the role of soil water content and slope on forest soil compaction was negatively significant