Studies on Green Panic Seed : V. Effects of seed treatments on emerging ability in soils with different moisture

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  • グリーンパニックの種子に関する研究 : V.異なる土壌水分条件下での出芽に対する種子処理法の影響
  • グリーンパニックの種子に関する研究-5-異なる土壌水分条件下での出芽に対する種子処理法の影響
  • グリーン パニック ノ シュシ ニカンスルケンキュウ 5 コトナル ドジョウ

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Abstract

Green panic seeds treated with soaking in running water and storing at temperature of 35℃ and differed in harvest date and volume weight were examined their emerging ability in soils with constant soil moisture 70, 55, 40% and varied soil moisture 35 (initial)-60 (later)%, respectively. Tests were made 5 times in 5 years after seed harvest. Results obtained were as follows ; 1. Emergence percentage was generally low in seeds 7 months after harvest, and increased a year after harvest in soils with 70% (pF2.5) and 55% (pF3.7) moisture. Emergence percentage in soil with 40% (pF4.2) moisture was lower than that in soils with higher moisture, but it increased gradually in the course of years. Exposure to low soil moisture (pF4.3) for 7 days from sowing markedly decreased emergence percentage untill a year after harvest, and this adverse effect continued for years. 2. Seeds stored at temperature of 35℃ showed remarkably higher emergence percentage and faster emergence than the seeds stored at room temperature, and this effect was considerable in soils with low moisture. Seed treatment, soaking seeds of 1.5 months after harvest in running water for 96 hours and then drying, fastened emergence and, in some cases, increased emergence percentage in soils with high moisture. 3. Emergence percentage of heavy seeds (volume weights were about 340mg/cc) was higher than that of light seeds (volume weights were about 270mg/cc), and the light seeds were affected more severely by low soil moisture (40% or inital 35%) than the heavy seeds. 4. Emergence percentage was lower at high temperature (25℃) than at low temperature (20℃) in soils with low moisture, while in soils with high moisture emergence percentages at both temperatures were equal. 5. In general, seed harvested in mid-September emerged better than seed harvested in late August.

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