The aim of this study was to determine the effect of composting on the height increase of Jengkol (Pithecolobium jiringa) puppies after three months of weaning at the Samarinda State Agricultural Polytechnic Nursery. This study used a completely randomized design, with 4 types of treatment on weaning media and 10 replications. The treatments were N0 (pure sub soil), N1 (75% sub soil + 25% compost), N2 (50% sub soil + 50% compost) and N3 (25% sub soil + 75% compost). Based on the results of the study, it was shown that the height of jengkol (Pithecolobium jiringa) seedlings was treated with different growth media, namely planting media (subsoil) without compost (N0), planting media with a ratio of subsoil and compost compared to 75% : 25% (N1), planting media with a ratio of subsoil and compost 50% : 50% (N2) and planting media with a ratio between subsoil and compost 25% : 75% (N3). that all growing media gave a positive response to the height increase of jengkol (Pithecolobium jiringa) seedlings. Treatment N2 showed greater height gain, but based on the Least Significant Difference Test (LSD) at the 95% confidence level, treatments N1 and N2 were not significantly different.

Keuntungan penggunaan pestisida nabati untuk mengendalikan hama pada tanaman adalah murah, mudah, ramah lingkungan dan tidak meninggalkan residu. Penelitian ini bertujuan untuk mengetahui efektivitas penggunaan ekstrak campuran daun Sirsak (Annona muricata L.), daun Tembakau (Nicotiana tabacum L.) dan deterjen sebagai pestisida nabati terhadap pencegahan dan pemberantasan hama belalang pada semai Jati (Tectona grandis L.f.) dan mengetahui tingkat kerusakan akibat serangan hama belalang pada semai Jati (T.  grandis L.f.). Penelitian dilaksanakan di Persemaian Politeknik Pertanian Negeri Samarinda. Ada tiga perlakuan yaitu kontrol, pencegahan dan pemberantasan dengan empat konsentrasi ekstrak campuran daun Sirsak (A.  muricata L.), daun Tembakau (N. tabacum L.) dan deterjen sebagai pestisida nabati yaitu 0 %; 0.5%; 1.0% dan 1.5%. Hasil penelitian menunjukan pertambahan konsentrasi ekstrak campuran pestisida nabati campuran daun Sirsak (A. muricata L.), daun Tembakau (N.  tabacum L.) dan deterjen berbanding lurus dengan persentase kematian hama belalang. Adapun frekuensi semai jati yang terserang hama belalang dan intensitas serangan hama belalang menunjukkan sebaliknya.