양액재배시(養液栽培時) 칼륨 농도(濃度)가 옥수수(Zea mays L.) 생육(生育)에 미치는 영향(影響)

Effect of Potassium on Corn(Zea mays L.) Seedling Growth under Nutrient Solution Culture

본(本) 실험(實驗)은 1995년(年) 5월(月) 23일(日)부터 1995년(年) 7월(月) 11일(日)까지 경희대학교(慶熙大學校) 수원(水原)캠퍼스 온실(溫室)에서 옥수수 광안옥 품종(品種)과 횡성옥 품종(品種)을 공시(供試) 재료(材料)로 하여 가리시비수준(加里施肥水準)을 달리한 양액재배(養液栽培)에 의해 7주간(週間)동안 실시(實施)하였고. 가리시비수준(加里施肥水準)은 무가리구(無加里區)(-K구(區)=0ppm)와 표준가리시용구(標準加里施用區)(K구(區)=248ppm), 표준가리시비량(標準加里施肥量)의 2배시용구(倍施用區)(2K구(區)=496ppm)및 3배시용구(倍施用區)(3K구(區)=744ppm)등 4수준(水準)으로 처리(處理)하였으며, 파종후(播種後) 매주(每週)마다 옥수수의 초장(草長), 엽면적(葉面積), 건물중(乾物重)을 조사(調査)하였으며, 엽녹소함량(葉綠素含量)은 3차(次) 예취시(刈取時)부터 측정(測定)하였다. 가리시비수준(加里施肥水準)에 따른 옥수수의 생육(生育)에 미치는 영향(影響)을 살펴본 결과(結果)를 보면 광안옥과 횡성옥의 두 품종(品種) 모두 표준가리시비량(標準加里施肥量)의 3배시용구(倍施用區)(3K구(區))에서 생육(生育)이 7주간(週間)동안 매우 저조(低調)하였고, 두 품종(品種)의 7주간(週間)의 총(總) 초장(草長), 엽면적(葉面積), 건물중(乾物重)은 K>2K>-K>3K구(區) 順이고 乾物重에서 광안옥 품종(品種)은 2K>K>-K>3K구(區) 순(順)으로 나타났다. 엽록소(葉綠素) 함량(含量)은 두 품종(品種) 공히 일정한 경향(傾向)이 없이 생육기(生育期)에 따라서 증감(增減) 현상을 보였으며 대체적으로 3K구(區)가 가장 함량(含量)이 적었고 K구(區)가 가장 많았으며, 작물생장속도(作物生長速度)(CGR)는 두 품종(品種) 모두 파종후(播種後)부터 3주(週)까지는 완만(緩慢)한 증가(增加)를 보이다가 파종후(播種後) 4주(週)째부터는 일정한 경향(傾向)이 없었다. 대체적으로 CGR은 두 품종(品種) 공히 K구(區)와 2K구(區)가 -K구(區)와 3K구(區)보다 높았다.

A nutrient solution culture experiment was conducted in the greenhouse at Suwon Campus. Kyung-Hee University from May 23 to July 11. 1995, to determine the effects of potassium application on seedling growth of Kwanganok and Hwengsungok cultivars of corn. Potassium was treated with four different levels, which are 0.248.496 and 744ppm for treatments without potassium (-k), standard potassium concentration (K), double(2k) and triple (3k) of standard potassium concentration, respectively. Plants were harvested at weekly interval for seven weeks. at which time plant height, leaf area and dry matter yield of corn seedling were measured, only chlorophyll content was taken for five weeks from three week after planting. Seedlings growth of Kwanganok and Hwengsungok cultivars was greatly retarded from planting to harvesting time in 3k treatment. The plant height, leaf area and dry matter yield of both cultivars during the whole period were decreased in order of K>2F>-K>3K, but dry matter yield of Kwanganok cultivar was decreased in order of 2K>K>-K>3K. Chlorophyll content of Kwanganok and Hwengsungok cultivars was irregularly fluctuated during growing period. but generally highest in K treatment and lowest in 3k treatment. The crop growth rates of seedlings of both cultivars were slow until the 3rd week after planting. but very fast thereafter. In general, CGR of both cultivars was higher in K and 2k treatments than -k and 3k treatments.