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1.由于猪殃殃的竞争,小麦穗数、粒数减少,粒重降低,导致减产。田间猪殃殃株数。茎枝数,干物重与小麦产量损失之间有极显著回归关系。猪殃殃茎枝数每增加1万茎/亩,穗数减少0.051万穗,穗粒数减少0.022粒,千粒重降低0.014克。小麦产量损失0.94斤。 2.猪殃殃与小麦共生时间越长,对产量影响越大。与小麦同时出草的猪殃殃,共生到三月底小麦拔节期,减产不显著;共生到四月底小麦抽穗期,减产达极显著水平。初步认为,三月底,四月初是影响小麦产量的临界期。 3.猪殃殃密度大的情况下,除了与小麦竞争,内部竞争也相当激烈,密度越大,分枝的成活率越低。 4.根据其危害损失,结合当前生产水平,建议把防除指标定为60茎/尺~2。猪殃殃是遍布全省、发生和危害正在逐年加重的麦田恶性杂草。1979—1981年,我所曾对其生物学和发生规律、危害损失等作了观察和研究,明确了田间发生密度10株/尺~2以上,即能造成小麦显著减产;3月下旬是药剂防除适期。1983—1984年,着重对猪殃殃和小麦之间的竞争关系及其影响作了一些研究,得出了根据猪殃殃田间发生量来估测小麦产量损失的回归方程式,并根据猪殃殃竞争的临界期,从理论上肯定了3月下旬是春季防除适期;建议改用60茎/尺~2为防除指标,比用株数为指标更准确,更易掌握。
1. Due to the competition of the pig apocalypse, the number of spikelets of wheat, the number of grains decreased, the grain weight decreased, leading to the reduction of production. The number of calamus plants in the field. There was a very significant regression relationship between the number of stems, dry matter weight and wheat yield loss. Apis merowing increased by 10 000 stems / acre, the number of spikes reduced by 0.051 million spikes, grains per spike reduced by 0.022 grains, grain weight decreased by 0.014 grams. Wheat yield loss of 0.94 kg. Pig Galium symbiotic with wheat longer, the greater impact on the yield. Pigs and apricots were planted at the same time with wheat, symbiotic to the end of March wheat jointing stage, yield reduction is not significant; symbiotic to the end of April heading date of wheat, yield reached a significant level. It is initially believed that the end of March and the beginning of April are the critical periods that will affect the yield of wheat. 3. In the case of a large population of pig carcasses, in addition to competing with wheat, the internal competition is rather fierce. The greater the density, the lower the survival rate of the branches. 4. According to its damage, combined with the current level of production, it is recommended that the control index set at 60 stem / feet ~ 2. Galium apiculata is a vicious weed in the wheat field that is increasing year by year in the whole province. From 1979 to 1981, I observed and studied its biology, laws of occurrence, damage and damage, and made it clear that the field density of 10 plants / foot to 2 or more could cause a significant decrease of wheat yield. In late March, the medicine Preventative period. 1983-1984, focusing on competition between the Galium aparine and wheat and its impact on the study made some conclusions obtained from the field occurrence of pigs to estimate the yield of wheat yield regression equation, and according to Galium aparine The critical period of competition is theoretically affirmed that the late March is the appropriate period for prevention and control of spring. It is suggested to switch to 60 stems / feet ~ 2 for controlling indexes, which is more accurate and easier to grasp than the number of plants.