Effect of Different Nursery Soils and Seeding Amounts on Seedling Growth of Rice

벼 기계이앙시 상토종류와 파종량이 묘생육에 미치는 영향

This experiment was conducted to determine the effect of nursery soils and seeding density on seedling growth characteristics in automatic facility for raising of rice seedlings. The seedling characteristics were evaluated for the 10-day and 15-day old seedlings grown in six different nursery soils including farm-made soils. Two levels of seeding amount, 250 g and 300 g/tray ($60{\times}30{\times}2.5$ cm), were applied to compare the seedling characteristics according to seeding density on different nursery soils. There were wide difference in soil components among the nursery soils tested. In acidity of nursery soils, 'Bunoog 2' was the highest, pH 5.1, and 'Samkyung' was the lowest, pH 8.6. The content of available phosphate was the highest value, 843 ppm, in 'Bunong 1' and the lowest (74 ppm) in farm-made soils. The total nitrogen content of 'Bunong 1, 2, 3' and 'Weonjo' soils was higher than there of 'Samkyung' and farm-made soils. There was no difference in plant height among three types of 'Bunong' soils (Bunong 1, 2, 3), but the seedling height grown in farm-made soils was shorter than there in other nursery soils. The plant heigh was slightly taller as the increase of seeding amount from 250 g to 300 g/tray, and the difference in plant height was larger in 15-day old seedlings as compared with 10-day old seedlings. Dry weight of seedlings grown for 15 days in three 'Bunong' soils was heavier than those in other nursery soils. Based on the growing characteristics of seedlings grown in different nursery soils, the heat result was obtained from a nursery soil, 'Bunoog 2', among six marketing nursery soils tested.

벼 자동화 육묘시설에서 상토의 종류와 파종량이 묘생육에 미치는 영향을 조사분석한 결과를 요약하면 다음과 같다. 상토의 성분분석 결과 산도(pH)는 '삼경상토'가 8.6으로 가장 높았고 '부농 2호'는 5.1로 가장 낮았다. 유효인산 함량은 '부농 1호'가 843 ppm으로 가장 높았고 '자가상토'에서 74 ppm으로 가장 낮았다. 전질소함량은 '원조상토' 및 '부농 1호', '부농 2호', '부농 3호'에서 다른 상토에 비해 높은 경향을 나타내었다. 상자당 파종량이 250 g 일때 상토의 종류에 따른 15일묘의 초장은 '부농 1호', '부농 2호', '부농 3호'에서 14.2~14.9 cm로 나타난 반면, '자가상토'에서의 초장은 13.1 cm로 짧았다. 상자당 파종량이 300 g으로 증가하면 상토 종류에 관계없이 묘초장은 길어졌고 그 차는 10일묘에서 보다 15일묘에서 크게 나타났다. 상토의 종류에 따른 15일묘의 건물중은 '부농 2호'가 13.3 mg으로 가장 무거웠고, 묘충실도도 '부농 2호'에서 0.96으로 가장 높았으며 '자가상토'와 '자가상토'에 시판상토(부농 2호)를 혼용한 처리구에서의 묘생육은 본 시험에 공시된 6종류의 시판 상토에 비해 저조하였고，매트형성도 불량하였다.