Getting a Firm Grip on Weed Control
2013-01-21 23:55:11

This is the VOA Special English Agriculture Report.(1)

When is a plant considered a weed? Experts at Penn State University have a simple answer: When the undesirable qualities outweigh the good qualities.(2)
何时植物被认为是杂草?宾州大学的专家有一个简单的答案: 当不良素质超过的良好素质。

Consider the fact that crops generally produce several hundred seeds from each plant. By comparison, each weed plant can produce tens or even hundreds of thousands of seeds.(3)

And some buried seeds can survive up to forty years -- or even longer.(4)

Eradicating weeds means that you have to remove all the seeds and roots so the plants will not grow back. But birds or the wind can reintroduce them to the land.(5)

A more common way to deal with weeds is to control them enough so that the land can be used for planting. Experts advise using two or more control methods to deal with weeds.(6)

Chemical weed killers or natural treatments like corn gluten can suppress weed growth. Dense planting of a crop can also act as a natural control.(7)

Bill Curran is a professor of weed science at Penn State, in University Park, Pennsylvania. He says one of the most common methods for suppressing weeds is dense planting.(8)
条例草案柯伦是宾夕法尼亚州、 宾夕法尼亚州大学园杂草科学教授。他说抑制杂草的最常用方法之一是密植。

He says a dense, competitive crop that quickly shades the soil will help suppress many weeds. The seeds need light to grow, so blocking the sun will reduce weed growth.(9)
他说密集的、 具有竞争力的作物快速加底纹土壤将有助于抑制许多杂草生长。种子需要光成长,因此,阻止太阳将减少杂草的生长。

Other controls include turning over the soil, pulling the weeds or covering them with mulch made of shredded wood, garden waste or other material.(10)
其他控件包括翻土、 拔杂草或覆盖的话覆盖丝的木、 庭院垃圾或其他材料制成的。

But even mulch has its limits. Natural resource specialists point out that weeds can be transported in mulch. This is also true of soil, grain, hay and animals.(11)
但即使覆盖有其限制。天然资源专家指出可以覆盖在运送杂草。这也是真正的土壤、 谷物、 干草和动物。

Yet animals like sheep or goats eat weeds, so they can provide a biological control. Insects and other organisms can also act as biological controls.(12)

Preventing the spread of weeds is an important part of weed management. Farm vehicles should be kept out of areas with weeds.(13)

If that is not possible, then clean off the equipment and your shoes when leaving.(14)

Some people burn weeds or bury them deeply or make them into mulch.(15)

Professor Curran says another way to make use of weeds is to compost them. Heat is produced in the process of making organically rich compost to improve soil.(16)

The heat will kill many, though not all, weed seeds. The same is true for seeds that pass through animals that graze on weeds.(17)

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