PROBLEM TO BE SOLVED: To provide a breeding raising seedling pot in which a breeding raising seedling pot made of a biodegradable resin in which planting changing is not necessary and direct planting can be performed is imparted with a tip structure that enables a light shielding effect and a push operation to a field soil, an enough biodegradability speed, an efficient productivity by melt molding, and characteristics suppressing an acetic acid/formic acid smell at the melt molding, and that is for improving the efficiency of seeding and the planting operation of seedling.SOLUTION: The breeding raising seedling pot has a tip structure of a cone shape or a pyramid shape that is formed by a composition in which a biomass powder of a plant origin that does not have a peak in the temperature range of 180-320°C, and has a peak in the temperature range of 300-400°C in the differential curve of a thermogravity decrease, and a polylactic acid are combined by the weight ratio of 5:95-70:30, wherein the polylactic acid that becomes a raw material has a molecular weight in the range of 2,000-100,000, and the biomass powder is a powder that contains the component of at most 250 μm by at most 80% by weight.COPYRIGHT: (C)2013,JPO&INPIT【課題】植替えの必要のない直植え可能な生分解性樹脂から作製される育種育苗ポットに、光遮蔽効果と圃場土壌中への押込み操作を可能とする尖端構造と十分な生分解性速度と溶融成形による効率的な生産性とその溶融成形時の酢酸・ギ酸臭を抑える特性を付与し、播種や苗の植付け作業の効率化を図るための育種育苗ポットを提供する。【解決手段】熱重量減少の微分曲線において、180~320℃の温度範囲にピークを有さず、300~400℃の温度範囲にピークを有する植物由来のバイオマス粉末とポリ乳酸を、5:95~70:30の重量比で配合した組成物から成形された円錐状もしくは角錐状の尖端構造を持ち、原料となるポリ乳酸は、その分子量が2,000~100,000の範囲にあり、バイオマス粉末は、250μm以下の成分を80重量%以上含有する粉末である。【選択図】図2
