Several plants founded in the field, for examples Swietenia macrophylla, Imperata cilindrica, carica papaya and Morinda citrifolia have chemical compounds that can be used as bioherbicide. The purpose of this research are to know content of Tannin and Flavonoid compounds in that plants and effect of interaction between type of leaf extract and bioherbicide solution formula i.e 10%, 20% and 30% againts effectivity of Ageratum conyzoides weeds control. Results of the research showed that leaf extract of S. macrophylla, I. cilindrica, C. papaya and M. citrifolia contain of Tannin and Flavonoid compounds with bioherbicide potential, with highest contain in S. macrophylla and lowest in I. cilindrica leaf extract. Interaction of type of leaf extract and solution formula gived very significant effect againts percentage of weed mortality and weed poisoning intensity of A. conyzoides weeds. Leaf extract of S. macrophylla, C. papaya and M. citrifoilia with 10-30% solution formula, were effective to control A. conyzoides weeds, with average of start time of weeds death was 3 days after bioherbicide application. Keywords : Bioherbicide, leaf extract, percentage of weed mortality, weed poisoning intensity

Woods which have low natural durability are easy to be attacked with wood staining fungi (blue stain) so can decrease its wood quality. Syzygium aromaticum, Melia azedarach and Piper betle contain of active components (botanical fungicide) that can be used as natural preservative to prevent staining fungi attack. The purpose of this research is to know effect of botanical fungicide species and preserved wood investigated, i.e Paraserianthes falcataria and Toona sureni on the attack intensity of wood staining fungi. Results of the research showed that interaction between botanical fungicide and wood species gived very significant effect on the attack intensity of wood staining fungi. The lowest of attack intensity was resulted on Toona sureni that had preserved by Melia azedarach leaf extract. The leaf extract of Syzygium aromaticum, Melia azedarach and Piper betle could keep Paraserianthes falcataria and Toona sureni wood against staining fungi.  Toona sureni wood was more resist against wood staining fungi than Paraserianthes falcataria, it was due to higher extractive in Toona sureni than Paraserianthes falcataria. To preserve woods which had bright colour such as Paraserianthes falcataria, more suitable to use Melia azedarach leaf extract which not change wood colour. Key words: Botanical Fungicide, Preservative, Wood Staining Fungi

Salah satu masalah dalam budidaya bibit Falcataria mollucana di persemaian adalah serangan hama Pseudococcus calceolariae. Serangan hama tersebut menghambat pertumbuhan bibit dan pada akhirnya menyebabkan kematian bibit. Beberapa tanaman yang ditemukan di lapangan, seperti Swietenia macrophylla, Azadirachta indica, Morinda citrifolia, dan Carica papaya, memiliki senyawa bioaktif yang dapat digunakan sebagai pestisida botani. Tujuan dari penelitian ini adalah untuk mengetahui jenis ekstrak daun yang efektif dalam mengendalikan hama P. calceolariae pada bibit F. mollucana berdasarkan penurunan insiden dan keparahan serangan P. calceolariae. Hasil penelitian menunjukkan bahwa ekstrak daun S. macrophylla, A. indica, M. citrifolia, dan C. papaya efektif dalam mengendalikan hama P. calceolariae pada bibit F. mollucana. Ekstrak daun A. indica memberikan penurunan insiden dan keparahan serangan P. calceolariae yang lebih tinggi dibandingkan dengan ekstrak daun lainnya, yaitu sebesar 80,13% dan 57,69%.

Penggunaan drone dalam pengelolaan hutan akan menjadi bagian dari inventarisasi hutan sehingga lebih efisien dan memiliki akurasi yang tinggi. Parameter yang paling jelas pada gambar drone adalah tajuk. Oleh karena itu, tujuan dari penelitian ini adalah untuk mengestimasi karakteristik pohon berdasarkan diameter tajuk citra drone. Sebanyak 9 plot berbentuk lingkaran dibuat dengan luas 0,02 ha per plot. Analisis regresi dilakukan untuk memodelkan diameter setinggi dada (Dbh) dan tinggi pohon (H) berdasarkan diameter tajuk citra drone. Hasil penelitian menunjukkan bahwa model regresi linier sederhana dengan variabel bebas diameter tajuk mampu menjelaskan variasi Dbh dan H, sehingga diameter tajuk dapat menjadi penduga Dbh dan H yang baik. Karakteristik Dbh dan H menunjukkan pertumbuhan sangat baik, indeks kelangsingan (indeks stabilitas tegakan) menunjukkan tegakan yang kokoh dan stabil.

Asmin Tropical Rain Forest Conservation 2 is a tropical natural forest which is a conservation area of ​​PT Asmin Bronang Kapuas, Central Kalimantan. The designation of new areas was carried out in 2018 and there was no research in the area that required data collection on the types of constituents of the area. The purposes of this research were to determine species composition, species diversity index, species evenness index, species richness index, and species dominance index. The method used in this study was collecting data on plants in area of ​​54.6 hectares with a sampling intensity of 1% using the Uniform Systematic Distribution Sampling with Random Start pattern. There are   14 plots in the form of nested samples with designations for 4 levels of plants (seedlings, saplings, poles, and trees). Results of the research showed that vegetation species composition was dominated by Shorea smithiana (Mahambung) of the Dipterocarpaceae family. Shorea parvifolia (Red Meranti), Euzyderoxylon zwageri (Ulin), Shorea smithiana (Mahambung), Mezzetia parviflora (Pisang-pisang), Syzygium spp. (Jambu-jambu), and Memecylon sumatrense (Kamasulan) are the 6 species that have the best regeneration rate, which are found at all plant levels. The highest IVI was Shorea smithiana (Mahambung) at the seedling was 46.55, pole 55.68, and tree 32.02 levels. At the sapling level, the highest IVI was Baccaurea bracteata Muell (Rambai forest) was 28.76. The species diversity index from seedling to pole level was moderate. At the tree level, the species diversity index was high (3.23). Species evenness index from seedling to tree level including height (0.82-0.92). The species richness index from seedling to pole was moderate. At the tree level, the species diversity index was high (7.45). The species dominance index of all levels was included in the low category (0.05-0.15).