In Vietnam, New Rice Growing Methods Aim to Reduce Methane

In Vietnam, New Rice Growing Methods Aim to Reduce Methane¹

Farmers in Vietnam are growing rice using a new method thought to reduce emissions² of methane gas and labor³ costs.

The method is called alternate⁴ wetting and drying, or AWD. It uses about 30 percent less water than traditional ways of growing rice. It also uses small flying vehicles called drones to put nutrients⁵ in the soil.

Traditional rice farming methods flood fields with water. The water stops oxygen from entering the soil. Low amounts of oxygen permit more methane-producing bacteria to grow.

Scientists say methane can trap 80 times more heat in the atmosphere than carbon dioxide over a short period of time. Climate scientists say releasing⁶ methane into the atmosphere increases the warming of the earth. A 2023 United Nations report said rice farming makes up about eight percent of all human-made methane in the atmosphere.

Vietnam is the world's third-largest rice exporter. Boats carry rice up and down the Mekong River, and the grain is an important food in Vietnam.

Vo Van Van is a 60-year-old rice farmer who lives along the Mekong River. For the past two years, he has been using the AWD method with support from one of Vietnam's largest rice exporters, the Loc Troi Group.

Van said using the drone to add organic⁷ fertilizer⁸ saves on labor costs. He says it is becoming harder to find people to work on the rice farms because more people are moving to the cities. The drone also puts the exact amount of fertilizer needed. Too much fertilizer causes the soil to release⁹ nitrogen¹⁰ gas. Nitrogen also traps heat in the atmosphere.

After the harvest, Van does not burn the remains¹¹ of the rice plants. Instead, the Loc Troi Group collects the extra plant material. It then sells it to other companies. These companies can use the remains to feed livestock¹² and grow mushrooms.

Van said the AWD method helps him in several ways. It lowers his costs while the amount of rice he produces is the same. Using organic fertilizer helps him sell for a higher price in European markets. He also has more time to take care of his own garden. "I am growing jackfruit and coconut," he said.

Nguyen Duy Thuan is the chief of the Loc Troi Group. He said the AWD method uses 40 percent less seed and 30 percent less water. The Loc Troi Group said the method is used on 100 hectares of rice farms. Thuan said the company wants to expand AWD farming to 300,000 hectares.

The Vietnamese government aims to grow low-emissions rice on 1 million hectares by 2030. Vietnamese state media reported that officials said the method could reduce production costs by about 20 percent and increase profits by more than $600 million.

Effects of a changing environment

In recent years, the Mekong River's water quality has changed. Dams in China and Laos have reduced water flow. Building projects cause problems because they use a lot of water and sand from the river. And rising sea levels have increased the amount of salt in the river's large delta¹³.

A recent study by Vietnam's Water Resources Institute estimates¹⁴ rice farmers lost millions of dollars every year because of salty water.

Lewis H. Ziska is a professor of environmental health sciences at Columbia University in New York City. He said that using different methods of farming can improve water use. Growing more kinds of rice would also help. Some kinds can better resist hot weather or need less water, Ziska said.

Some rice farmers in Vietnam are already growing different kinds of rice. Nguyen Van Nhat is director of a rice export company. He said growers are using rice that can grow in salty water and in hot weather.

He also said the export company is using different methods to dry the rice because of changes in the weather. He said unseasonal rains are making it harder to dry the rice in the sun. As a result, the company has built places to dry it in their factory. The company will also put machines to dry the grain closer to the rice fields.

"We don't know which month is the rainy season, like we did before," Nhat said.

Words in This Story

emissions –n. gases released¹⁵ by a process

alternate –adj. something that happens for a period and does not happen for the following period, repeating the pattern over time

organic fertilizer –n. nutrients for plants that are considered organic, meaning they do not have man-made materials in them

delta –n. a triangular area where a river flows into the sea and that has rich soil

1 methane   

n.甲烷，沼气

参考例句：

• The blast was caused by pockets of methane gas that ignited.爆炸是由数袋甲烷气体着火引起的。
• Methane may have extraterrestrial significance.甲烷具有星际意义。

2 emissions   

排放物( emission的名词复数 )； 散发物（尤指气体）

参考例句：

• Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
• Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。

3 labor   

n.劳动，努力，工作，劳工；分娩；vi.劳动，努力，苦干；vt.详细分析；麻烦

参考例句：

• We are never late in satisfying him for his labor.我们从不延误付给他劳动报酬。
• He was completely spent after two weeks of hard labor.艰苦劳动两周后，他已经疲惫不堪了。

4 alternate   

adj.交替的，间隔的；v.（使）轮流　　

参考例句：

• He and I clean our room on alternate days.我和他隔日轮流打扫我们的房间。
• That was a week of alternate rain and sunshine.那是晴雨天交替的一周。

5 nutrients   

n.（食品或化学品）营养物，营养品( nutrient的名词复数 )

参考例句：

• a lack of essential nutrients 基本营养的缺乏
• Nutrients are absorbed into the bloodstream. 营养素被吸收进血液。 来自《简明英汉词典》

6 releasing   

v.释放( release的现在分词 )；放开；发布；发行

参考例句：

• Releasing his arm, she laid her hand upon his shoulder. 她放掉他的胳膊，却把手放到了他的肩上。 来自英汉文学 - 双城记
• The drag operation is still terminated by releasing the mouse button. 释放鼠标按键时，拖动操作将立即终止。 来自About Face 3交互设计精髓

7 organic   

adj.有机的，有机物的；有组织的

参考例句：

• Organic farming is expanding everywhere.有机农业正在各地迅速发展起来。
• The organic fertilizer shall keep the soil in good heart.这有机肥一定会使土壤保持肥沃。

8 fertilizer   

n.肥料，化肥

参考例句：

• Fertilizer enriches the soil.肥料使土壤肥沃。
• Get some more fertilizer for the garden.给花园再多施些肥料。

9 release   

vt.发布，发表，发行；释放，放开

参考例句：

• After my examination I had a feeling of release.考完试后我有如释重负之感。
• This medicine will give you release from pain.这药吃后会解除你的疼痛。

10 nitrogen   

n.[化]氮

参考例句：

• The atmosphere consist of more than 70% of nitrogen.大气中含有70%以上的氮气。
• What is the percentage of nitrogen in air?空气中所含的氮的比例是多少？

11 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

12 livestock   

n.家畜，牲畜

参考例句：

• Both men and livestock are flourishing.人畜两旺。
• The heavy rains and flooding killed scores of livestock.暴雨和大水淹死了许多牲口。

13 delta   

n.（流的）角洲

参考例句：

• He has been to the delta of the Nile.他曾去过尼罗河三角洲。
• The Nile divides at its mouth and forms a delta.尼罗河在河口分岔，形成了一个三角洲。

14 estimates   

估计

参考例句：

• Unofficial estimates put the figure at over two million. 非官方的估计数字为200万以上。
• We got estimates from three different contractors before accepting the lowest. 我们得到3个承包商的报价后，接受了最低的报价。 来自《简明英汉词典》

15 released   

v.释放( release的过去式和过去分词 )；放开；发布；发行

参考例句：

• He was released on bail pending committal proceedings. 他交保获释正在候审。
• With hindsight it is easy to say they should not have released him. 事后才说他们本不应该释放他，这倒容易。