公共育成牧場における主要雑草の発生環境

概要

論文の詳細を見る
The relationship between the occurrence of noxious weeds and natural conditions and management of pastures in cooperative livestock farms throughout the country was investigated on the basis of data collected during surveys conducted in 1981. The analysis of six noxious weeds, i. e. , Artemisia spp. , Petasites japonicus, Cirsium nipponense, Taraxacum officinale, Polygonum cuspidatum and Digitaria ciliaris was carried out in applying the epidemiological method based on six parameters relating to natural conditions and management of pastures including mean annual air temperature, mean annual precipitation, soil texture type, land inclination, nitrogenous fertilizer application and grazing pressure. The results obtained were as follows; 1) Artemisia spp. invades pastures when the air temperature and precipitation are low as well as when a high amount of nitrogenous fertilizer is applied and under a high grazing pressure. P. japonicus, T. officinale and C. nipponense invade pastures when the air temperature and precipitation are low. In addition, P. japonicus and T. officinale grow profusely in pastures with a gentle inclination and under low grazing pressure. C. nipponense invades pastures on plains under a moderate grazing pressure ranging from 200 to 500 C. D.. P. cuspidatum grows profusely in pastures to which high amounts of nitrogenous fertilizer are applied. D. ciliaris grows well when the air temperature and precipitation are high and invades pastures to which a low amount of nitrogenous fertilizer is applied in spite of the low grazing utilization (Fig. 2, Table 2) 2) Mean annual air temperature and mean annual precipitation are very significant factors affecting the infestation of the six weed species in pastures. Moreover, for P. japonicus, T. officinale and D. cirialis, land inclination and grazing pressure are important factors whereas for C. nipponense land inclination, plays a major role. Nitrogenous fertilizer application and grazing pressure play a major role in the growth P. cuspidatum (Table 3). 3) In order to control weeds in pastures, emphasis should be placed on proper management practices including fertilizer application, grazing utilization especially in the swards with a high risk of weed infestation associated with natural factors such as meteorological and soil conditions.
日本雑草学会の論文
1986-10-26

公共育成牧場における主要雑草の発生環境

スポンサーリンク

概要

著者

関連論文

スポンサーリンク