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露從今夜白，預防低溫冷害和病蟲害

2018-09-08 11:21:30 來源：中國農(nóng)機網(wǎng)整理發(fā)布 閱讀量：39333 評論

　　【中國農(nóng)機網(wǎng) 熱點關注】“八月節(jié)……陰氣漸重，露凝而白也。” 
——《月令七十二候集解》
9月8日剛好是今年的第十五個節(jié)氣——白露，從這天開始，天氣開始逐漸轉涼，晝夜溫差變大。露是白露節(jié)氣后特有的一種自然現(xiàn)象。由于天氣轉涼，白晝陽陽光尚熱，然太陽下山，氣溫便很快下降，至夜間空氣中的水氣遇冷凝結成細小的水滴，附著在枝葉或花瓣上，呈白色，尤其是經(jīng)晨光照射，更加潔白無瑕，因而得“白露”美名，實際是表征天氣已轉涼。也有“白露白迷迷，秋分稻秀齊。”的說法，意思是說，白露前后若有露，則晚稻將有好收成。

 
未來三日天氣狀況
此后三日，全國大部分地區(qū)將有降雨，其中，西藏東南部、四川南部、海南島南部和中國臺灣島大部等地的局地有大雨或暴雨，南方地區(qū)伴隨大風降溫天氣。因此，要注意關注冷空氣活動和降溫天氣對農(nóng)業(yè)生產(chǎn)產(chǎn)生的影響，以及局部地區(qū)強降水可能引發(fā)的山洪、地質(zhì)災害及雷暴大風等強對流天氣的影響。
另外，在這之后，北方地區(qū)降水將開始明顯減少，長江中下游地區(qū)、西南地區(qū)東部、華南和華西地區(qū)往往會出現(xiàn)連陰雨天氣，華南沿海可能會有臺風造成的大暴雨。但同時還將重視的是如果長江中下游地區(qū)的伏旱、華西地區(qū)、華南地區(qū)的夏旱，得不到秋雨的滋潤，都可能形成夏秋連旱。北方部分地區(qū)如果出現(xiàn)嚴重秋旱不僅影響會秋季作物收成，還會延誤秋播作物的播種和出苗生長，影響來年收成。
 
預防低溫冷害和病蟲害
這一時節(jié)冷空氣日趨活躍，常出現(xiàn)秋季低溫天氣，影響晚稻抽穗揚花，因此要預防低溫冷害和病蟲害。冷空氣入侵時，可采用灌水保溫，低溫之前灌水二寸以上，可增溫1~2℃。低溫來時，晴天可日排夜灌淺水；陰雨天則要灌厚水；一般天氣應干干濕濕，以濕為主。
 
農(nóng)事管理
蔬菜：秋收作物成熟后，菠菜、油麥菜等速生蔬菜陸續(xù)播種，以滿足國慶節(jié)前后的市場需求。根據(jù)各種蔬菜栽培要點精細整地后均勻播種，覆土深淺以保證出苗所需土壤墑情即可。田間管理需做好跳甲、菜青蟲、蚜蟲的防治。此外，為了讓市民吃上“放心菜”，除嚴禁使用劇毒農(nóng)藥外，采收前必須掌握用藥安全間隔期。
水稻：抓好稻田水分管理，適度露曬田，控制禾苗分蘗且提高有效分蘗率。注意防治稻瘟病、紋枯病、稻飛虱、三化螟和稻縱卷葉螟等。
茶葉：在進行白露茶采摘的同時，可選擇優(yōu)良的茶樹品種，進行扦插育苗。秋插要選好地塊，整好苗床；扦插前，苗床須充分灑水；扦插時，用拇指和食指來住插穗的葉柄著生處，垂直或稍微斜插入土中，深度以葉柄與畦面平齊為宜；插好后及時進行苗圃管理。
花生：秋花生正值始花期，應注意施足底肥、及時追肥，否則常因前期營養(yǎng)不足引起植株營養(yǎng)生長不良，致使產(chǎn)量不高；前期雨水多，花生苗期怕漬，要及時疏溝排水，防止田間積水；注意病蟲害防治，出苗后要及時查苗，補苗，并加強肥水管理。
畜禽：九月份中旬以后，天氣由熱轉涼，是水牛長膘和繁殖的黃金季節(jié)，必須及時抓好秋膘，及時做好配種繁殖工作；做好越冬干草的貯存工作、保溫措施；生豬要做好消毒隔離工作，防止高熱癥為特征的傳染病的發(fā)生，山羊做好羊痘疫苗預防接種。
水產(chǎn)養(yǎng)殖：9月水溫、氣溫較高，養(yǎng)殖魚類進入快速生長期，也是病害的高發(fā)季節(jié)，要做好飼料投喂與病害預防工作。可在飼料中適當添加維生素、免疫增強劑等提高抗病力。同時要密切關注暴雨、臺風等突發(fā)性天氣，要重點做好預防臺風、洪水等措施。
 
此文由本網(wǎng)整理發(fā)布，部分資料來源：中國氣象局、博羅農(nóng)技，如有侵權或異議請聯(lián)系我們。

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