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Kyiv attacked by kamikaze drones: Report_我的网站

美国恐怖故事第三季

A | Kyiv, Oct 17 (UNI) At least three explosions were heard in the Ukrainian capital Kyiv, just after air raid sirens went off.

The explosions happened at around 7 am local time, said the BBC. One of them sounded close to the city centre. Mayor Vitalii Klitschko said residential buildings in the central Shevchenkivskiy area have been damaged.

Andriy Yermak, head of President Volodymyr Zelensky's office, said the attacks were from so-called kamikaze drones.

It comes a week after Kyiv was hit by several Russian missiles at rush hour, in a nationwide attack which left 19 dead.

Writing on the Telegram social media site, Klitschko said they were in the Shevchenkivskiy district, which was hit by several strikes last week.

He said rescuers were on site, and told residents to stay in air raid shelters.

Russian President Vladimir Putin said the strikes last week were in retaliation for the bombing of a key bridge linking Russia to occupied Crimea, which he blamed on Ukraine.

It was the first time during the war that the centre of Kyiv was directly targeted.

Putin also said most designated targets had been hit, and there was no need for more large-scale strikes on Ukraine. He said it was not his aim to destroy the country.

UNI ING。 8月25日消息，中科院地球环境研究所联合多家国外机构完成一项农业研究，用粪肥合理替代化肥，既能改良土壤，还可以提升粮食产量。 一直只施化肥，时间久了土壤有机质会被消耗，土壤里面各类养分比例失衡，地里微生物也没法好好发挥作用。研究团队整理全球179个站点，一共710组田间观测数据，发现粪肥可以把土壤碳、氮、磷分别提升27.8%、24.4%、29.2%，让土地肥力慢慢恢复过来。按照测算，如果在条件合适的地区推广粪肥替代，全球每年可以多产出4.82亿吨到7.08亿吨谷物，土壤碳氮磷储备也能提升26%至32，增产和养土两件事可以同时实现。但它并不是万能解法，不管时间还是地域，都有硬性条件。从时间上看，持续施用粪肥之后，农作物增产效果大约19年就会摸到天花板，可土壤养分积累要差不多30年才会完全饱和。土壤里面磷元素增幅超过72.4%之后，增产效果就会明显变弱，氮磷比下降超过26%，反而有减产风险。

B | 地域上面限制同样不小，想要拿到双赢效果，年均降水需要落在1119毫米至1237毫米区间，同时土壤本身碳氮比也要处在合适范围。 太干旱的地方，粪肥很难分解；雨水太多，养分又会被雨水冲走，这两种情况都可能出现粮食、土壤双双受损的局面。简单来说，粪肥替代化肥是很好的农业思路，但不能直接照搬到处乱用。要结合当地降水、土壤情况，把控施用时长和用量，选对适用区域，才能真正做到土地变肥，粮食增产。