Yielding Ability and Competitive Influence of Tillering Maize(Zea mays L.) when Mixed with Uniculm Hybrid

형태적(形態的)으로 다른 두 옥수수 (Zea mays L.)의 혼작(混作)이 청예(靑刈)및 종실수량(種實收量)에 미치는 영향(影響)

This study was done to investigate the interplanting effects of corn, when a corn hybrid with tillers (IK derivaties) was interplanted with a corn hybrid without tillers(Jinjoo Ok). The interplanting ratios of two hybrids, IK and Jinjoo Ok, were 1 to 1, 1 to 2, 1 to 3, 2 to 1, and 3 to 1. The interp1anting effects were compared with monoculture for major agronomic characteristics. 1. The plant height was increased when interplanted regardless of the interplanting ratios of the two hybrids. The general growth of IK hybrid was a little hindered when the interplanting ratio of Jinjoo Ok hybrid increased. 2. The number of tillers produced by the IK hybrid increased until 40 days after emergence and appeared to increase as the interplanting ratio of IK hybrid increased. 3. When monocultured, the fresh weight of IK hybrid per 10a was 8,096kg and and 6,677kg at silking and dough stages, respectively and these were 77%, 53% over the fresh weight of Jinjoo Ok at the sarne stages. When IK and Jinjoo Ok hybrids were interplanted in 1 to 1 ratio, the fresh weight of IK was 20% higher than that of Jinjoo Ok monocultured. 4. The highest grain yield per 10a was obtained from the Jinjoo Ok hybrid monocultured and the yield was 434kg. Even the interplanting ratios between IK and Jinjoo Ok were 1 to 1 and 1 to 3, the grain yield of Jinjoo Ok was 16% and 13% over the IK, respectively. 5. Root and stalk lodging of IK hybrid was 29% when monocultured and seemed to increase as the interplanting ratio of Jinjoo Ok increased. The lowest lodging was found when the interplanting ratio of IK and Jinjoo Ok was 1 to 1. 6. Stem diameter of IK hybrid was also decreased as the interplanting ratio of Jinjoo Ok increased. The ear height of IK was lowered as the interplanting ratio of IK was increased. The two hybrids tested seemed to have tolerance to the black streaked dwarf virus(BSDV).

형태적(形態的)으로 상이(相異)한 다종다얼성(多種多蘖性)인 특성(特性)인 형매교배(兄妹交配)된 IK 교잡종(交雜種)과 무얼성(無蘖性)인 진주옥 교잡종(交雜種)을 공시(供試)하여 청예수량(靑刈收量), 종실수량(種實收量) 및 이와 관련(關聯)된 형질(形質)을 비교(比較)하고자 IK와 진주옥의 파종비율(播種比率)을 1 : 1, 1 : 2, 1 : 3, 2 : 1, 3 : 1로 혼파(混播)한 것과 IK와 진주옥을 각각(各各) 단작(單作)하여 얻어진 결과(結果)를 요약(要約)하면 다음과 같다. 1. 공시(供試)된 품종(品種) 모두가 단작(單作)보다 혼작(混作)에서 초장(草長)이 큰 경향(傾向)이었고 진주옥의파종비율(播種比率)을 증가(增價)할수록 IK의 생육(生育)은 저조(低調)한것으로 나타났다. 2. 출현(出現) 후(後) 40 일경(日頃)까지 모든 처리구(處理區)에서 IK의 분얼수(分蘖數)는 증가(增加)하였는데 IK의 파종비율(播種比率)이 많을수록 분얼수(分蘖數)의 증가(增加)가 뚜렷하였다. 3. IK 단작(單作)의 10 a당(當) 청예수량(靑刈收量)은 출사기(出絲期)에서 8,096kg이었고, 호숙기(糊熟期)서는 6,677kg으로 가장 많았는데 이는 진주옥 단작(單作)에 비(比)해 각각(各各) 77%와 53%가 증가(增加)되었고 IK와 진주옥의 1 : 1 처리구(處理區)에서는 진주옥 단작(單作)보다 20%가 증가(增加)되었다. 4. 10 a당(當) 종실수량(種實收量)은 진주옥 단작(單作)에서 434kg이었고 IK 단작(單作)은 373kg이었는데 IK와 진주옥을 1 : 1과 1 : 3으로 혼파(混播)한 구(區)에서 IK단작(單作)의 종실수량(種實收量)보다 16%와 13%가 각각(各各) 증가(增價)되었다. 5. IK 도복(倒伏)은 단작(單作)에서 29.2%로 진주옥의 파종비율(播種比率)이 증가(增價)할수록 IK 도복(倒伏)이 증가경향(增加碩向)이었는데 IK와 진주옥을 1 : 1 혼파(混播)한 구(區)에서 IK의 도복율(倒伏率)이 10.9%로 크게 경감(輕減)되었다. 6. 진주옥의 파종비율(播種比率)이 많을수록 IK의 경직경(莖直俓)이 감소(減少)하였고 착수고(着穗高)는 IK의 파종비율(播種比率)이 많을수록 IK의 착수고(着穗高)가 낮아지는 경향(碩向)이었다. 흑조위축병(黑條萎縮病) 리병율(罹病率)은 두 품종(品穩) 모두 파종비율(播種比率)과는 관련(關係)없이 저항성(抵抗性) 품종(品種)임이 확인(確認)되었다.