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AGRICULTURE REPORT - Getting to the Root of How to Water Trees

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This is the VOA Special English Agriculture Report.

Some trees can survive a long time without water. Think of trees that grow in the desert. But other trees may need more moisture than they can get from rainfall or from the air -- from, say, coastal or mountain fog.

The soil stores moisture during cooler weather. But most of that moisture is gone by the middle or end of the hottest months of the year.

A white pine tree in Bradford, New Hampshire
A white pine tree in Bradford, New Hampshire

Trees and other plants can look thirsty. Leaves can become droopy and hang downward. They can also turn yellow. Yellowing can be a sign of too much water. But it can also be a warning sign of too little water.

The Vacaville Tree Foundation is a volunteer community group in California. It has advice for watering newly planted trees and established trees.

With a newly planted tree, the roots have not yet spread out from the root ball. The root ball can become dry faster than the dirt around it. So put water on the area of the root ball and the surrounding soil until the roots become established.

Once a tree is well established, water deeply instead of often. The amount of water needed depends on the tree and the soil. Clay soils hold water for longer periods while sandy soils hold less water. During the hottest season, a deep watering may satisfy a tree for anywhere from ten days to four weeks.

Part of skilled watering is knowing to stop when the soil needs a little time to absorb the water. Otherwise the water runs off the surface and gets wasted.

Ted Swiecki is a plant scientist in California with the Phytosphere Research company and the Vacaville Tree Foundation. He says people should not water established trees at the base of the trunk. This can harm the tree.

Too much water in the soil at the base of a tree can lead to the growth of fungi. If the area is too wet, harmful organisms have a better chance to invade the tree and cause disease.

Mr. Swiecki says this is true especially in Mediterranean and semi-dry climates. Many trees in these climates have adapted to having a dry area near their base during the hottest season.

TED SWIECKI: "Water displaces air in the soil. And roots are aerobic; they require oxygen for the soil to function properly. So if you keep the soil saturated and there's no air there, and then you are basically starving the roots for oxygen."

And that's the VOA Special English Agriculture Report, written by Jerilyn Watson. For more growing advice, and to learn English, go to www.unsv.com. You can also find us on Facebook, Twitter and YouTube at VOA Learning English. I'm Bob Doughty.

网友的学习评论(10条):
作者:david
good
作者:lvjiaying1984
It is important to know how to water the trees so that we can take advantage of the water given to the trees. Every year in China, in Spring, people from every society of the country plunge into the campaign to plant trees which is known as a holiday. When I was junior high school student, I planted trees with other students in white caps and gowns. We dug hole in the soil and put the tree in the hole. Then put the soil we got from where the tree further occupied in the hole and then water it.
作者:lvjiaying1984
However, after this, nobody took care of it and most of the trees died of starting of water. The Chinese people have got into the habit of doing something without the expected results. It is juts a form, just to conform to what has been told by the person in a senior position. And in planting trees, people everywhere, in every part of the society, are just to demonstrate that they are following the leaders' instructions. I also remember that once in a list of investigation
作者:lvjiaying1984
in which we were expected to answer the questions listed in the table. But because we knew nothing about what was being written in the list, we were asked to copy the answers which had already been brought about by persons who were competent in answering the questions. The aim to copy the answers was only to show that students were interested in what was being talked about in the table. And this kind of faith prevailed in other areas of Chinese society.
作者:lvjiaying1984
One of the strongest is the one carried out by the government, taking its pick of the right candidate who would lead others to the right direction. From the village to the top of the country, this kind of faith develops. Although I am already a mature man, coming of age, who should have been given to right to vote for the persons for us who would lead us towards the right direction, I have never been asked to vote. Compared with other nations such as the USA
作者:lvjiaying1984
where the candidates can throw out what they will do to change the poor situation, China's voting system is far from satisfaction. As a civilian of China, I have never been asked to vote for a person that should bring motivation for us Chinese people. On the contrary, the American people enjoy a much better way of voting for the candidate that would probably become their leader. Every person as long as they have come of age has the right to vote for the person.
作者:lvjiaying1984
But China's most people just don't have the right.
作者:Peter
Let nature take its course.
作者:coral
It is important to master how to water trees.For that, we can have more and more trees.
作者:yuanqiou098
It seems that the trees are different from the human.We eat,at least two meals a day,at most seven or eight.However,the trees can use lots of water at a time.Because it can save water.If we put this advantage on our crops or rice,we can improve our amount of planting.
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