雅思大作文范文:農(nóng)業(yè)化肥和機(jī)械運(yùn)用的負(fù)面影響

雅思大作文范文:農(nóng)業(yè)化肥和機(jī)械運(yùn)用的負(fù)面影響 具體的內(nèi)容和中國教育在線平臺(tái)一起來看看吧

由于肥料的研發(fā)和機(jī)器的改進(jìn)，食物的產(chǎn)量大幅的提高了并且價(jià)格便宜。有的人認(rèn)為這會(huì)負(fù)面的影響人類健康和當(dāng)?shù)厣鐓^(qū)。問：何種程度上說你是否同意？

思路解析

這是一道觀點(diǎn)類作文，在審題時(shí)候一定要注意這道題的限定詞，因?yàn)椤癲eveloped fertilizers and better machinery” 使得食物“produced in greater amount and much cheaply”，有人認(rèn)為這對(duì)“human health and local communities”是有害的，我們提出觀點(diǎn)和論證的時(shí)候要緊扣這些限定范圍。比如有同學(xué)一看到產(chǎn)量增加，然后就把“這會(huì)減少全人類饑餓”作為論點(diǎn)，那就跑題了。

然后我們一起來看下，肥料、機(jī)械以及糧食產(chǎn)量增加價(jià)格變低分別對(duì)人類健康和當(dāng)?shù)厣鐓^(qū)產(chǎn)生什么問題，以及是否可以改善。

首先來看肥料，大部分肥料里面普遍含有一定的化學(xué)成分，而這些成分可能會(huì)附著于農(nóng)作物上。這些化學(xué)成分達(dá)到一定的累積會(huì)對(duì)人體造成傷害。同時(shí)在使用這些肥料的時(shí)候，這些化學(xué)成分也會(huì)被釋放到環(huán)境中，造成對(duì)土壤，水源以及空氣甚至生態(tài)系統(tǒng)的破壞，比如使土壤硝酸鹽濃度過高。但是隨著化肥技術(shù)進(jìn)一步發(fā)展和進(jìn)步，有機(jī)化肥可以很好的降低食品生產(chǎn)種植過程中對(duì)環(huán)境的負(fù)擔(dān)和對(duì)健康的影響。

然后來看機(jī)械，農(nóng)業(yè)機(jī)械的運(yùn)用好處有三方面，一是用機(jī)械替代人力能夠更快的完成犁地、播種、澆水、施肥、收獲等步驟，有效避免錯(cuò)過農(nóng)時(shí)，大幅提高耕種效率；二是因?yàn)樯a(chǎn)效率的提升，農(nóng)民花更少時(shí)間就能完成原來的工作，意味著他們能夠開墾更多的農(nóng)田；三是機(jī)械相比人力或牲畜在耕地能更深，進(jìn)而使得農(nóng)作物獲得更好的成長環(huán)境。但是機(jī)械的過度使用容易對(duì)環(huán)境造成負(fù)面影響，一是機(jī)械本身功率較大需要消耗石油，容易產(chǎn)生排放污染。二是使用機(jī)械過度深耕土地，容易破壞土壤結(jié)構(gòu)、造成營養(yǎng)的流失和產(chǎn)能的降低，并且難以恢復(fù)。

后來看經(jīng)濟(jì)問題，食物產(chǎn)量上升價(jià)格降低，對(duì)于吃的人來說可能是好事，但對(duì)于農(nóng)民來說，意味著其收入降低，如果想獲得更高的收入意味著要耕種更多的土地，但是現(xiàn)實(shí)中由于耕地飽和等原因可能難以實(shí)現(xiàn)。而化肥和機(jī)械本身又是不小的支出，當(dāng)農(nóng)民發(fā)現(xiàn)耕地不賺錢后，便會(huì)放棄耕種外出務(wù)工，這就造成了當(dāng)?shù)貏趧?dòng)力的流失，進(jìn)而出現(xiàn)留守兒童或老人的問題。

雅思寫作范文示例

As the world’s population continues rising, machines and fertilizers are used to maximize the amount of food produced and stabilize the price of food within an affordable range. However, while we are trying hard to produce enough to feed the global population, we still fail to limit the adverse effects of agricultural activities on human health and local area.

The use of fertilizers and other farm chemicals like herbicides and pesticides, is unsustainable and physically and environmentally damaging.  Those farm chemicals can be toxic especially when organisms are exposed to high concentrations.  Even if fertilizers are scientifically applied to crops in a way which will prevent them from accumulating on the food in harmful concentrations, they are difficult for our bodies to process and consume large amounts of food treated in this manner, which would probably result in health impacts.  Worse still, the application of these chemicals will spoil the land, waterways and air.  Once released into the atmosphere，they are absorbed into the soil, mixed into air or digested by tissues of simple organisms, all of which enable them to grow to toxic concentration and remain threat for the whole ecosystem.

For another, the modernization and mechanization of agriculture also impose detrimental impact on the environment.  During the past few years, the weight and size of the machinery had increased significantly, which in some cases exceeded the soil’s tolerance for load.  The operation of machines to irrigate the land would damage the soil structure, making it more vulnerable to erosion and causing greater loss of nutrients and poorer crop yields.  Such damages caused by heavy agricultural machinery are usually more permanent and hard to recover.

In conclusion, although various scientific and technological methods are identified to enable farmers to grow crops more efficiently while maintaining yields，a sustainable and healthy agriculture system has yet been achieved.

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