HUBUNGAN ANTARA STATUS NUTRISI DENGAN PRODUKSI BUAH DAN BENIH SURIAN ( (A. Juss.) M. Roem.) DI HUTAN RAKYAT

Abstract

SURIAN ((A. Juss.) M. Roem.) DI HUTAN RAKYAT Toona sinensis Relationship Between Nutrient Status with Fruit and Seed Productions of Surian Toona sinensis on Various Agroforestry Systems ((A. Juss.) M. Roem.) ABSTRACT On-farm trees become important sources for forest tree seeds distribution. Therefore, it is necessary to understand the effects of different land management of on-farm trees on seed production. This study was aimed to determine the nutrient status of the soil and leaf on the various types of agroforestry in small holder forests in West Java, and their effect 5 on seed production. The study was conducted in eight square plots (50 x 50 m) of different planting patterns. The nutrient contents of the soil, and leaf in three samples of each plot were analyzed. The number of panicles per plant, flowers per panicle, fruits per panicle, and seeds per fruit were counted from 4 trees of each plot. The results showed that the P, K, Mg, and organic C concentration in leaves significantly varied among agroforestry patterns. Leaf N concentration was not significantly different among plots, and its availability was not a limiting factor for the seed production. Leaf Ca and Mg concentrations positively correlated with the number of panicles per plant. Ca positively affected the number of panicles per tree, while K negatively affected the number of fruits and P negatively affected the seed production. The highest yield of fruit and seed were recorded on surian monoculture plantation with intercropping or on mixed garden with intercropping.