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夏至：白晝漸長， 農(nóng)事繁忙

2018-06-21 17:42:53 來源：中國農(nóng)機網(wǎng)整理發(fā)布 閱讀量：27885 評論

　　【中國農(nóng)機網(wǎng) 市場行情】“夏至，日北至，日長之至，日影短至，故曰夏至。至者，極也。”
 
　　——《恪遵憲度抄本》
 
　　作為二十四節(jié)氣中個被確認的一個節(jié)氣，開始先人是用先人的采用土圭測日影確定的。
 
　　這一天開始，太陽幾乎直射北回歸線，到達一年的北端，北半球各地迎來一年中白晝長的一天。都說“不過夏至不熱”，夏至后的氣溫會繼續(xù)升高，再過二三十天，就會進入一年當中熱的時候。同時，由于這個時間段的地面受熱強烈，空氣對流旺盛，午后到傍晚時候經(jīng)常會出現(xiàn)雷陣雨天氣。這種熱雷雨往往來的突然，并且時間短降雨范圍小，人們稱“夏雨隔田坎”。
 
　　夏至后進入三伏天，氣溫持續(xù)升高的同時光照足，雨水增多，良好的天氣條件使得農(nóng)作物生長旺盛。當然，與此同時，伴隨而來的就是害蟲、雜草的迅速滋長蔓延，它們不僅與作物爭水爭肥爭陽光，而且是多種病菌和害蟲的寄主，老話常說：“夏至不鋤根邊草，如同養(yǎng)下毒蛇咬。”因此，務必要加強田間管理工作。高原牧區(qū)也將迎來草肥畜旺的黃金季節(jié)。
 
　　夏至節(jié)氣是華南東部全年雨量多的節(jié)氣，往后常受副熱帶高壓控制，出現(xiàn)伏旱。為了增強抗旱能力，奪取農(nóng)業(yè)豐收，在這些地區(qū)，搶蓄伏前雨水是一項重要措施。
 
　　另外，夏至時節(jié)正是江淮一帶的“梅雨”季節(jié)，這時正是江南梅子黃熟期，空氣非常潮濕，冷、暖空氣團在這里交匯，并形成一道低壓槽，導致陰雨連綿的天氣。一方面，對于夏旱地區(qū)來說自然是喜大普奔，并且在淮河以南地區(qū)，早稻抽穗揚花，田間水分管理上要求足水抽穗，濕潤灌漿，干干濕濕，這樣才能既滿足水稻結(jié)實對水分的需要，又能透氣養(yǎng)根，保證活熟到老，提高籽粒重；但另一方面而言，頻繁發(fā)生的暴雨天氣容易造成洪澇災害，對于農(nóng)作物尤其是旱作物來說也是不利于生長的。因此，要特別注意作好防洪準備，雨季到來之前將田間排水溝挖好，有堵塞的及早疏通，確保降雨后田間不積水、不澇地；對溫室墻體、屋頂?shù)嚷┯瓴课贿M行檢查和修繕，防止雨季坍塌；對草苫、保溫被等存放情況進行檢查，確保不因漏雨而造成損失。
 
　　對于瓜果蔬菜，要及時采摘，科學合理澆水施肥，做好病蟲害的防治工作。而針對大棚作物，也要注意在降雨時不要掀開溫室棚膜，盡量避免雨淋到作物，避免雨水帶來細菌，導致蔬菜染病。
 
　　在水產(chǎn)養(yǎng)殖方面，隨著氣溫的升高，池塘水溫也達到了二十七度左右，這個溫度是魚蝦適宜生長的溫度，它們的攝食強度會加大，餌料利用率提高，進入生長旺期。這時候，養(yǎng)殖戶可以適當增加餌料投喂了量，并注意預防病害的發(fā)生。定期使用一些消毒藥物，殺滅水體中的病原菌、病原體，適當用一些微生態(tài)制劑，包括光合細菌、芽孢桿菌等這些，通過生物的辦法，抑制病原微生物的大量滋生。
 
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