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油菜應(yīng)對連陰雨及時搶收減損技術(shù)意見
2024-05-11
13:25:48
來源:全國農(nóng)業(yè)技術(shù)推廣服務(wù)中心 閱讀量:10942
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【農(nóng)機網(wǎng) 科技創(chuàng)新】 4月以來,長江中下游地區(qū)強降水、強對流天氣頻發(fā),湖北、湖南、江西、浙江等地降水日數(shù)普遍在18天以上,漬澇災(zāi)害風(fēng)險較高。據(jù)氣象預(yù)測,5月中旬后,南方降水可能再度加強,油菜適期減損收獲難度較大。為科學(xué)應(yīng)對連陰雨影響,各地要堅持“兩分”(分類管理、分區(qū)統(tǒng)籌),做好“三搶”(搶排積水、搶時收獲、搶晴晾曬),強化防災(zāi)減災(zāi),減少產(chǎn)量損失,確保顆粒歸倉,努力奪取夏油豐產(chǎn)豐收。
堅持分類管理 做好分區(qū)統(tǒng)籌
(一)長江上游區(qū)以“穩(wěn)”奪高產(chǎn)。該區(qū)域天氣晴好,油菜收獲條件適宜,建議優(yōu)先采用分段收獲方式,提高千粒重和含油量,降低綠籽率和機收損失率。
(二)長江中游區(qū)以“搶”少減產(chǎn)。該區(qū)域目前土壤濕度高,油菜收獲難度較大,建議優(yōu)先采用化學(xué)催枯聯(lián)合機收的方式,縮短后熟時間,搶抓天氣晴好有利時機,加快收獲進度,最大限度減少連陰雨影響。
(三)長江下游區(qū)以“早”控風(fēng)險。該區(qū)域油菜尚未進入成熟收獲期,要提前做好農(nóng)機調(diào)配和應(yīng)急預(yù)案,堅持成熟一塊收一塊的原則,合理安排收獲進度,避免雨水集中導(dǎo)致階段性收獲受阻。
抓好三搶作業(yè) 確保顆粒歸倉
(一)搶排積水降漬澇。降水較多地區(qū),要及時清溝理墑,搶排水、快散墑,為天晴之后機械搶收創(chuàng)造條件、爭取時間。特別對倒伏油菜田,要加快排水降漬,避免角果泡在水中導(dǎo)致籽粒發(fā)芽,減少霉變。
(二)搶時收獲降損失。根據(jù)成熟程度,合理調(diào)配農(nóng)機,做好搶時收獲。密切關(guān)注天氣變化,對已進入黃熟期的油菜,趕在連陰雨來臨前5—7天收割搶收,保證雨前菜籽有1—2天晾曬時間。如果在油菜黃熟初期有連陰雨,應(yīng)做好收獲準備,待陰雨過后再及時收獲,不宜在陰雨來臨之前收割。
(三)搶晴晾曬(烘干)防霉變。機收菜籽含水量較高,易發(fā)熱產(chǎn)生霉變。收獲后要搶抓晴好天氣,充分利用各類場地抓緊晾曬,降低水分含量,防止霉變發(fā)生。有條件的地方,利用烘干設(shè)施或應(yīng)急風(fēng)干設(shè)施,盡快使籽粒含水量降至安全水分(8.5%—9.0%)入倉。對因雨來不及入倉或室內(nèi)不具備晾干條件的,要覆蓋防雨膜,雨停后及時揭膜晾曬。
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