Komposisi Vigor Kecambah Tusam Pada Beberapa Tingkat Devigorasi Dan Kerapatan Benih

Abstract

A major problem encountered during seed procurement is low vigor of long term stored seed, affecting in turn the success of out planting. The objective of this study was to determine the effect of devigoration and density levels of tusam (Pinus merkusii) seeds on the sprouts vigor composition to support the nursery success. A completely randomized design with a single factor (i.e. seed densities) was used in this experiment. The density was arranged in 6 levels, which were predetermined based on the percentage of normal germinates of various seed lots. This variation was obtained through seed-ageing treatment at 6 durations, i.e. 0, 72, 120, 192, 216, and 240 hours (as devigoration levels). From each of those measured 2 six levels seed density, thereby acquiring in all 6 densities ranging from 50 to 99 seeds per 600 cm area. It turned out that ageing treatment (devigoration levels) for 240 hours caused decrease in percentage by about 23% in comparison with the control (without ageing or at zero-hour ageing). Further, the different seed densities did not significantly affect vigor status of germinant, growth rate, growth uniformity/ simultanity, and delta value as well as the score-based nursery success. The decrease in seed vigor (devigoration) as much as 1920% could be overcome by increasing density as much as 16 seeds per 600 2 cm area. In general, the germinant of tusam seeds still belonged to the normal criteria (N), i.e. strongly normal (K) and less strong (KK). This condition is suspected imply to the possibility of seed to survive in the field.

The effect of method and germination paper substrate on viability of Eucalyptus pellita F. Mull seed

“…Perkecambahan adalah suatu pengaktifan embrio yang mengakibatkan terbukanya kulit benih dan munculnya tumbuhan muda. Perkecambahan benih juga merupakan salah satu indikator yang berkaitan dengan mutu benih (Rohandi & Widyani, 2009;Saupe, 2009). Perkecambahan benih dipengaruhi oleh kondisi lingkungan perkecambahan, seperti air, suhu, cahaya, dan media (Suhartati, 2007).…”