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地點: 呼和浩特市
開展時間: 2025-04-05
舉辦單位: 內蒙古自治區(qū)糧食經濟學會、內蒙古自治區(qū)糧食行業(yè)協會
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地點: 成都市
開展時間: 2025-04-10
舉辦單位: 青島中凱國際會展有限公司
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地點: 北京市
開展時間: 2025-04-10
舉辦單位: 北京市市容環(huán)境衛(wèi)生協會、北京市園林綠化行業(yè)協會、北京市公園綠地協會
2025年南方早稻生產技術意見
2025-03-07
10:10:43
來源:全國農技推廣中心 閱讀量:16442
評論
當前,南方早稻播種、育秧、移栽由南向北陸續(xù)展開。2月中下旬以來,江南大部、華南西部和北部等地持續(xù)陰雨5—6天。據氣象部門預測,南方稻區(qū)大部春季氣溫接近常年同期到偏高,但冷空氣過程將時有發(fā)生,華東南部、華中東南部、華南東部等地降水量偏少2—5成,江南中西部、云南東部降水量偏多,早稻生產面臨局部氣溫突變、干旱和濕漬害等風險。針對當前氣象條件和水稻生產特點,各地要密切關注天氣變化,按照“精播良種、培育壯秧、適時移栽、防災抗逆、調優(yōu)群體、適期收獲”原則,適時推進播種育秧進度,加強全生育期管理,為早稻豐收奠定基礎。
優(yōu)選良種,適時播種
根據各地生態(tài)條件、移栽方式等,選擇優(yōu)質高產、廣適抗逆、熟期適宜的早稻品種。播種前做好曬種、選種、浸種、消毒、催芽,防止惡苗病等種傳病害發(fā)生,確保芽齊芽壯。當日平均氣溫穩(wěn)定通過12℃時,要抓住“冷尾暖頭”,避開陰雨天氣搶時播種;長江中下游早稻力爭在3月中下旬完成播種。有條件的地方提倡采用工廠化規(guī)模育秧方式,采用大(中)棚、薄膜覆蓋等方式開展保溫育秧。
科學調控,培育壯秧
育秧期間如遇“倒春寒”天氣,要注意保溫設施完好,及時以水調溫,保持田間溫度,防止爛秧死苗。華南地區(qū)已播秧田要加強防寒工作,根據秧苗長勢和種植茬口進行分類管理,促進秧苗健壯生長。未蓋地膜的要及時補蓋地膜,采取“夜灌日排”“晴排雨灌”等科學排灌方式,調節(jié)秧田水熱狀況,有效防止出現爛種、爛秧。如遇持續(xù)高溫天氣(膜內溫度≥32℃),要及時揭膜通風,防止高溫燒苗;如遇春季突然升溫、膜內溫度迅速升高接近35℃、秧苗出現葉片卷曲發(fā)黃等高溫脅迫癥狀時,需及時通風降溫。1葉1心期要適溫保濕促壯苗,注意防止綿腐病、立枯病等發(fā)生。2葉1心期開始通風煉苗,施肥促蘗。煉苗時需逐步揭膜,堅持“兩頭開門,前后開窗,一邊揭開,日揭夜蓋,最后全揭”原則,通風時先灌水,防止生理失水造成死苗。移栽前3—5天打好“送嫁藥”,選用合適藥劑噴施,預防螟蟲、稻瘟病、南方水稻黑條矮縮病等。未采用育秧專用基質的秧田可在移栽前3—5天根據秧苗生長情況,畝施4—5公斤尿素“送嫁肥”,施后加淋一次清水。長勢偏弱的秧苗,要適當增施磷鉀肥、促進生長。
分類指導,適時移栽
當日平均氣溫穩(wěn)定通過15℃時要搶晴插秧。機插田塊要提高耕整地質量,移栽前田塊要沉實,做到適時早插、力求淺插,適當增加密度,可選用25厘米行距的
插秧機或30厘米行距的插秧機,株距10cm左右。機插秧齡一般不超過25天、葉齡3葉1心至4葉1心,避免秧齡過大引起緩苗期延長或栽后分蘗減少,手插或拋栽的秧齡可適當延長;早稻畝栽插2.0萬—2.2萬穴,雜交稻每穴2—3粒種苗,常規(guī)稻每穴5—6粒種苗,確保畝基本苗數分別達到5萬—6萬和10萬—12萬。稻稻油三熟制地區(qū)或延遲栽插的早稻,本田營養(yǎng)生長期短,移栽時要增加栽插密度,確?;久鐢?。
優(yōu)化肥水,調優(yōu)群體
合理施肥。在施足基肥的基礎上要早施分蘗肥,促進低位分蘗發(fā)生,一般在移栽后5—7天畝施尿素4—5公斤。在抽穗前15天左右施用?;ǚ?,合理確定氮肥、鉀肥用量,一般畝施尿素3—5公斤、鉀肥3—5公斤,對于前期長勢偏弱群體,可在抽穗前30天左右施一次促花肥,促進大穗形成。水稻抽穗后看苗補施粒肥,一般畝施尿素1—2公斤或噴施磷酸二氫鉀等葉面肥;注意做到“三不施”,即苗不黃不施,陰雨天不施,有病害不施??茖W管水。做到薄水插秧,淺水返青,濕潤促蘗。插秧時田間灌薄水1.5—2厘米,返青期田間水層保持2—3厘米,分蘗期淺水促進分蘗和早生快發(fā);基本苗較多的田塊,建議提早曬田控苗,促進大穗發(fā)育,提高莖蘗成穗率,促進大穗發(fā)育,構建高產穩(wěn)產群體;幼穗分化期保持田間水層3—5厘米,如抽穗期遭遇高溫,灌5—8厘米水緩解高溫熱害;抽穗揚花后應采取間歇灌溉方法,蠟熟期灌水要“干干濕濕”,以干為主,收割前5—7天斷水。
防控病蟲,適時收獲
密切關注植保部門預測預報,做好病蟲害綜合防控。在噴好“送嫁藥”的基礎上,重點抓好封行期和破口期施藥防治,重點防控稻瘟病、紋枯病、稻飛虱、稻縱卷葉螟等。早稻收獲期間連續(xù)高溫、暴雨等災害性天氣較多,易出現高溫逼熟、穗發(fā)芽和倒伏,造成減產和品質下降。要及時組織收獲,推廣應用帶秸稈粉碎裝置的機械化聯合收脫裝備,提高收獲效率,做到顆粒歸倉。一般在齊穗后25天左右,全穗失去綠色、穎殼90%變黃時及時收獲。
來源:農業(yè)農村部水稻專家指導組、全國農業(yè)技術推廣服務中心
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