논문 상세보기
pp.429-434
돈분뇨 액비 시용 후 경운처리에 의한 청보리, 호밀, 트리티케일, IRG의 생육과 잡초발생량 차이를 구명하였다. 파종기에 한발이 지속된 포장의 수분함량을 조사한 결과 화학비료 처리구와 무처리구에서는 8.5 ~ 9.1%를 나타냈으나, 액비를 살포한 포장은 20.5 ~ 23.1% 수준이었다. 파종 15일 후에 유묘출현율은 액비 처리구에서는 화학비료 및 무처리구에 비하여 청보리는 2.9배, 호밀과 트리티케일은 각각 2.2배, 2.4배 높게 나타났다. 또한 시험작물 모두 초장이 액비시용구에서 약 2배 이상 증가하였다. 월동 후 최고분얼기에는 모든 작물의 초장이 화학비료 및 무처리구에 비하여 액비처리구가 1.1 ~ 1.3배 길었고 경수도 비슷한 경향을 보였으며, 분얼수는 청보리, 호밀 및 트리티케일이 각각 4.5개, 5개 및 6개/개체로 화학처리구에 비해서 1개체씩의 증가를 보여 한발에 의한 초기 생육차이가 월동 후에도 지속되는 것으로 확인되었다. 한편 잡초발생은 답리작포장이기 때문에 뚝새풀이 주로 발견되었으며, 액비 처리구는 경운으로 m2당 잡초발생수가 5개 수준이었으나, 화학비료 처리구는 무경운으로 145개 발생되어 29배의 잡초발생 차이를 보였다. 월동 후 액비시용하고 경운을 하면 비료효과가 지속되어 화학비료 처리구보다 우수한 생육을 보였으나, 액비시용 후 무경운 처리는 낮은 생육을 보였다. 수확기 생체중 역시 액비처리후 경운처리구가 가장 높았으며, 청보리, 호밀, 트리티케일, IRG 모두 증수되었다. 따라서 한발이 지속될 경우 액비살포 후 경운은 작물의 영양원으로 뿐만 아니라, 수분공급의 효과로 종자의 발아를 촉진시켜 초기생장 및 수량증수에 크게 기여하며 부수적으로 잡초발생도 감소시키는 것으로 판단된다.
This research was conducted with whole crop barley, rye and triticale sown and investigated its growth and development and changes of weed occurrence after application of chemical fertilizer and liquid-pig-manure. Moisture content at seeding time under a subsequent drought condition was 8.5 ~ 9.1% at the chemical fertilizer treatment and the untreated plot, but liquid-pig-manure showed a level of 20.5 ~ 23.1% moisture. At 15 days after seeding, the germination ratios of whole crop barley, rye and triticale were 2.9 times, 2.2 times and 2.4 times higher, respectively, in liquid-pig-manure treatment than in a chemical fertilizer and non-treatment plots. In addition, the plant length in all the test crops increased by more than about 2 times in the liquid fertilizer treatment. At the maximum tiller stage after overwinter, the plant length of all the test crops in the liquid fertilizer treatment was 1.1 ~ 1.3 times longer than in the chemical fertilizer and non-treatment and the number of tillers also showed a similar trend. The number of tillers of whole crop barley, rye and triticale were 4.5, 5, 6 per plant, respectively, which were at least one tiller number increased as compared with the chemical fertilizer treatment, indicating that difference of the initial growth under drought condition was continued by after-overwinter. On the other hand, water-foxtail was a major weed occurred in upland paddy after rice cultivation. The weed number per m2 in liquid-pig-manure treatment followed by plowing showed 5, but the weed in the chemical fertilizer treatment reached 145, which was 29 times increase without tillage. Plowing after liquid-pig-manure use at overwinter resulted in continuation of the fertilizer effect, so that the growth and development was better than the chemical fertilizer treatment. However, liquid-pig-manure use without plowing caused worse effect in the growth and development than the chemical fertilizer treatment. Fresh weight at harvesting stage was highest with the plowing treatment after liquid-pig-manure use and the rest of the test crops also resulted in the increased fresh weight with the same treatment. Accordingly, it is thought that when drought continues, plowing after application of a liquid-pig-manure is largely contributed to the initial crop growth by accelerating seed germination due to nutrition and moisture supply as well as by decreasing weed occurrence.
