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Indriyani S, Arisoesilaningsih E, Wardiyati T, Purnobasuki H (2011) A model of relationship between climate and soil factors related to oxalate content in porang (Amorphophallus muelleriBlume) corm. . The abiotic environment as well as the biotic environment, involved climate and soil affect directly or indirectly to plant growth as well as plant substance. The objective of the research was to obtain a model of relationship between climate and soil factors related to oxalate content in porang corm. Porang corms were collected from five locations of porang agroforestry in East Java. The locations were (i) Klangon Village, Saradan Subdistrict, Madiun District; (ii) Klino Villlage, Sekar Subdistrict, Bojonegoro District; (iii) Bendoasri Village, Rejoso Subdistrict, Nganjuk District; (iv) Sugihwaras Village, Nggluyu Subdistrict, Nganjuk District and (v) Kalirejo Village, Kalipare Subdistrict, Malang District. Geography variable consist of altitude. Climate variables consist of percentage of radiation, temperature and rainfall. Soil variables consist of electrical conductivity, pH, soil specific gravity, soil organic matter, available of calcium, and cation exchange capacity (CEC). Vegetation variables consist of species of plant tree and percentage of coverage. Porang vegetative growth variables consist of plant height, number of bulbil, canopy diameter, and petiole diameter. Corm variables consist of corm diameter, corm weight, and corm specific gravity. Oxalate variables consist of total oxalate, soluble oxalate, insoluble oxalate, and density of calcium oxalate crystal. Oxalate contents were measured based on AOAC method. All of variables were collected from first to fourth growth period of porang. Data were analyzed by smartPLS (Partial Least Square) software. The results showed that there were significantly direct effect between altitude and temperature, altitude and CEC of soil, temperature and CEC of soil, altitude and percentage of coverage, temperature and percentage of coverage, CEC of soil and percentage of coverage, CEC of soil and petiole diameter, petiole diameter and corm diameter, and petiole diameter and corm oxalate content. There were no significantly direct effect among altitude, temperature, percentage of coverage and petiole diameter; and among corm total oxalate, soluble oxalate, insoluble oxalate, and density of calcium oxalate crystal and corm diameter. The value of Goodness of Fit of the developing model was R²=0.99.

Anggrek (Dendrobium sp.) sebagai salah satu komoditas tanaman hias yang termasuk tanaman epifit dan cukup popular di Indonesia. Tanaman anggrek ini memiliki nilai ekonomis yang cukup tinggi dan diminati konsumen cukup banyak. Produksi tanaman anggrek menunjukkan peningkatan pada tahun 2017 sebesar 20.045.577 tangkai, sedangkan pada tahun 2018 sebesar 24.717.840 tangkai (BPS, 2019). Permintaan yang terus meningkat harus diikuti dengan persediaan bibit dalam jumlah yang besar dan mutu yang baik. Penelitian ini dilakukan untuk mengetahui dan mempelajari pengaruh media tumbuh dan jenis pupuk daun yang sesuai untuk pertumbuhan tanaman anggrek (Dendrobium sp.). Penelitian ini merupakan penelitian faktorial yang menggunakan Rancangan Petak Terbagi (RPT) dengan menggunakan 2 faktorr yaitu faktor pertama sebagai petak utama adalah perlakuan pupuk daun Mamigro (P1), Super Bionik (P2), Grow Quick LB (P3) dan pada faktor kedua sebagai anak petak adalah perlakuan media tanam arang kayu (M1), moss hitam (M2), serabut kelapa (M3), arang sekam (M4). Berdasarkan hasil analisis diketahui bahwa terdapat interaksi antara penggunaan pupuk daun dengan media tanam terhadap panjang tanaman sebesar 8,30 cm, panjang daun sebesar 5,27 cm, jumlah daun 5,00 helai dan lebar daun sebesar 0,48 cm. Penggunaan pupuk daun Grow Quick LB dengan media tanam arang sekam menunjukkan hasil yang terbaik pada pertumbuhan tanaman anggrek.