This study was conducted to establish the techniques of the continuous wheat production of high yield level and to standardize of quality uniformity. It was selected the experimental places which were Iksan of Jeonbuk, Gwangju metropolitan city and Hapcheon of Gyeongnam. Farmers of participating in the experiment were 13 persons with two types of advanced and lower levels of their techniques in wheat cultivation, and total numbers of fields were 22 fields. The common information on the field soils were silt loam and loam in soil textures, all most deep and some moderate in soil depth, imperfectly drained in drainage classes, coastal and interior plain with some alluvial fan or local valley in land topography. It was investigated in status of the physico-chemical properties of soils. Soil pH was 6.0 in mean values with 5.2 ~ 7.5 ranges, organic matter(OM) was 25 g/kg with 16 ~ 39 ranges, available P2O5 194mg/kg with 47 ~ 586 ranges, available SiO2 164mg/kg with 57 ~ 454 ranges, in exchangeable cations, K was 0.46 with 0.20 ~ 0.98, Ca was 6.2 with 3.6 ~ 11.7, Mg was 1.8 with 0.9 ~ 3.4 cmol(c)/kg in ranges, and these properties of soils were higher in advanced than those of lower level farmers. The amounts of fertilization in N-P2O5-K2O were 184-49-50 kg/ha in farmers application, 108-114-47 kg/ha in soil testing and 94-83-41kg/ha in standard recommendation. Fertilizer application amounts by farmers were higher than those of soil testing and standard recommendation by 76 ~ 90 kg/ha in N and 3 ~ 9 kg/ha in K2O, and less by 34 ~ 74 kg/ha in phosphate fertilizer.

연초의 본포초기해충인 숯검은밤나방 유충의 경제적 피해수준 밀도를 정하기 위한 기초연구로 연초이식전 포장내 유충밀도를 확정하기 위한 표본추출방법과 유충밀도와 연초감수량(품종 : Hicks)의 관계에 관하여 실험하여 다음과 같은 결과를 얻었다. 1. 사과찌꺼기, 쌀겨 및 토끼풀더미의 표본추출방법중에서 토끼풀더미가 비교적 높은 표본추출효율을 보였으며 토끼풀더미는 유충의 령기와 실험시기에 따라 의 표본추출효율을 보였다. 2. 포장내잡초의 유무에 따라 표본추출효율은 차이가 있으며 령충을 공시했을 때 잡초가 없는 상태에서는 , 잡초가 있는 상태에서는 의 표본추출효율을 보였다. 3. 숯검은밤나방 유충밀도(X)와 피해율(D)의 관계는 였으며 피해율은 액아의 생장과 결주에 따른 연초개체군의 보상결과를 감안하여 보상피해율(D')을 구하였으며 의 치선회귀관계를 보였다. 4. 보상피해율(D')과 감사량(Y, kg/10a)의 관계는 였다. 5. 관측치만 이용한 접종충밀도와 감수량의 관계 (Y=2.68X) 보다는 피해율 및 보상피해율을 대입하여 얻은 추정회귀식(Y=4.2+1.38X)이 실측치에 더적합하였다.