Abstract
The Experiments were conducted by moderate season culture of each of early, medium and late maturing varieties which were considered to be of strong salt tolerance in low and high salty reclaimed areas (0.2% at the May). This study was carried out to investigate the proper nitrogen fertilizer level and seeding rates at reclaimed saline land in Korea. The proper seeding rates were $40kg\;ha^{-1}$ in 0.2% saline land. The dry matter production of barnyard millet was possibly estimated by exponential functions of $Y=0.0098X^2+0.7030X+2.6267$. Effects of nitrogen rate on agronomic characteristics, forage yield, and chemical composition of barnyard millet to reclaimed tidal land are summarized as follows: The proper nitrogen fertilizer level was $200kg\;ha^{-1}$ in 0.2% saline land. N was absorbed actively before the emergence of the barnyard millet but showed relative decrease thereafter. The early growth of the barnyard millet was inhibited, resulting in the favorable late growth, increased panicle weight and ratio of matured grain. These results suggest that barnyard millet is the most forage crops for cultivation on reclaimed tideland in view of the good emergence and forage production.
사료용 피 직파재배시 적정 파종량 시험에서 입모수는 파종량이 증가할수록 많았으며, 입모율은 41-42% 정도였다. 경수도 파종량이 증가할수록 많았고, 초장은 파종량이 많을수록 증가하였으나 $50kg\;ha^{-1}$에서는 감소하였다. 파종량이 많았던 $50kg\;ha^{-1}$에서 도복지수가 3이었다. 건물중은 파종량 $40kg\;ha^{-1}$에서 가장 높았고, TDN 생산량은 파종량이 적을수록 높았다. 수량반응 곡선상 $36kg\;ha^{-1}$에서 최대수량 건물수량이 추정되었다. 변화 상태의 회귀식은 $Y=0.0098X^2+0.7030X+2.6267$으로 표시되었다. 출수기는 파종량이 많을수록 늦어지는 경향이었다. 사료용 피 직파 재배시 질소질 비료 $150-250kg\;ha^{-1}$ 시비에서 건초 수량의 차이는 없었으나, 무시용 대비 건초 수량은 200 및 $250kg\;ha^{-1}$ 시비에서 16.6톤 $ha^{-1}$ 및 16.9톤 $ha^{-1}$로 43% 및 45% 정도 높았다. 조단백질 수량(CP)은 건물수량과 비슷한 경향으로 무질소구에서 0.28톤 $ha^{-1}$이었던 것이 질소 $250kg\;ha^{-1}$ 시비구에서 0.54톤 $ha^{-1}$ 이었다.
