bursa survival seasonal life rotation bare used 8000 system pinpoint month predation annual seed jan cover winter when exact ground experiment model froe chrysanthemum germinate http reserve viola 4000 only crop may archived different vertical raphanu cousen rhoea worked problem orgprint denmark polygonum evelopment arvensi recutita percent soil mode rate wheat calendar top protection persicaria number into raphanistrum good randomly arvest influence weed institute yearly surface fumaria statu step persica how papaver scale direct nigrum included log danish capsella 10000 segetum los ion normal least mos distribution but over fixed already harvest harrowing daily tripleurospermum populat known reproductive underseed aug agricultural position random poa science plant under feb input tillage layer some quo lupin infestation flora arenaria germinat dec movement depend gras pastori cynapium large need cultural field per treatment degree strategy research unaffected apply long aviculare than without parameterizing chancellor sensitive measure present effective catch apr department petersen pertubation rasmussen intervention 1964 hederifolia officinali fit important oat expert computer dormant several time influenced all vegetative 2000 variation serpyllifolia common solanum plouging flakkebjerg les practice mas data inodorum amplexicaule development limitation aethusa general doe germination disturbance control know willingnes proliferation mortality arvesi day course 103 tell nov stage specific competitivenes production during simulating sinapi efficacy exponential 6000 centre modelled org prevention depth repen other seedling needed term veronica lamium except annua stellaria undisturbed plan relative count stubble each holst dynamic hope clover mixed cultivation predict natural proportional 1990 jun 1986 finished convolvolu half intraspecific growth chamomilla validation not removal attribute row hoeing level one simple season trend none sown oct effect any prod carrying material year specie dormancy ontrol spring interspecific barley media preventive jul mar illage management most primary decrease equal 00001506 competition trifolium II sep focu