The aim of this study was to investigate the relationship of physical and chemical properties of soils with ecological species groups in Pinus taeda plantation forests in Guilan province, Iran. For this purpose, a random systematic 100 m × 200 m grid sampling plan was used to establish 75 sampling plots. In each plot, soil factors and percent cover of each herbaceous species were recorded. Sub-plots of 32 m 2 were used for herbaceous species measurements. At each sampling plot, soil samples were collected in depth of 0-30cm. The result of TWINSPAN analysis revealed five dictinct groups. Multivariate analysis was performed through CANOCO 4.5 to explore the relationship between soil factors and plant community. Results showed that the most important soil factors in these communities were N, P, K, OC, Ca, Mg, TNV, pH, SP, soil texture (clay, sand, silt) and EC. The results indicated that the physical and chemical soil characteristics have a significant role in the growth and distribution of plant communities in the study area.

Abstract. Mursyidin DH, Nazari YA, Badruzsaufari, Masmitra MRD. 2021. DNA barcoding of the tidal swamp rice (Oryza sativa) landraces from South Kalimantan, Indonesia. Biodiversitas 22: 1593-1599. The tidal swamp rice (Oryza sativa L.) landraces of the South Kalimantan, Indonesia, has been known for hundred years ago with a better adaptation to the local conditions, such as acidity, salinity, and metals contamination. However, the genetic insight of these landraces has not fully understood. Here, the rbcL region of tidal swamp rice from this region was successfully sequenced, aligned, analyzed, and deposited into the GenBank with accession numbers of MT818188–MT818201. The multiple alignments of these sequences showing a barcoding motif with eight mutation or polymorphic sites with both substitutions (transition-transversion) and indels (insertion-deletion). Based on this marker, the tidal swamp rice has a low genetic diversity, only 0.086. However, the UPGMA and maximum likelihood (ML) analyses revealed that this germplasm was grouped into five and twoclusters or clades, respectively. In this case, Bayar Putih is closely related to Siam Panangah and farthest from Lemo. This information might help to develop conservation and breeding programs of the tidal swamp rice landraces in the future.

Pemupukan merupakan suatu upaya penyediaan unsur hara yang cukup guna mendorong pertumbuhan vegetatif tanaman yang sehat dan produksi tandan buah segar (TBS) yang maksimal dan ekonomis serta ketahanan terhadap hama dan penyakit. Tujuan penelitian adalah untuk mengetahui kandungan unsur-unsur hara yang terdapat di dalam daun kelapa sawit dan tanah dari aplikasi pemupukan yang telah diberikan melalui pengambilan contoh daun dan tanah. Penelitian ini dilaksanakan di kebun kelapa sawit Balai Pengawasan dan Sertifikasi Benih Perkebunan Provinsi Kalimantan Selatan Penelitian ini dilakukan dengan mengambil contoh daun sebanyak 60 sampel daun yang terletak pada pelepah daun kelapa sawit ke-17 dan mengambil 4 contoh tanah yang telah dikompositkan dari beberapa titik pengambilan di sekitar pohon kelapa sawit. Hasil penelitian menunjukkan masih rendahnya kandungan hara yang terdapat pada tanah dan jaringan tanaman kelapa sawit, sehingga perlu adanya perbaikan kultur teknis di kebun kelapa sawit.kata kunci : Status hara, Kultur Teknis, Kelapa Sawit.

Coconut (Cocos nucifera L.) is an agricultural commodity that is very prospective to be developed in Indonesia and other tropical countries, but its development is constrained by various factors. This study aimed to determine the genetic identity, as well as diversity and relationships of native coconut germplasm from South Kalimantan, Indonesia, using a cpDNA (matK) marker. The results show that this germplasm has a low-level genetic diversity, π% = 0.0258. However, the phylogenetic analysis revealed that native coconut germplasms from this region have separated into different clades, two for Maximum Likelihood and three for Neighbor-Joining, where Genjah Kuning 3 has closely related to an outgroup. Thus, this information is important as a fundamental reference in developing new high-yielding coconut in the future