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開展時間: 2025-04-28
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2025年春玉米科學灌溉技術指導意見
2025-04-23
10:04:08
來源:全國農技推廣中心 閱讀量:874
評論
東北丘陵漫崗區(qū)和三江平原區(qū)
(一)基本情況。本區(qū)域包括內蒙古大興安嶺東南麓丘陵區(qū)、黑龍江西部、吉林中西部,3月中旬以來該區(qū)域大部溫度較往年同期偏高,降水量偏多,目前0—20cm土壤相對含水量70%—85%,墑情整體適宜,黑龍江東南部局地墑情過多。
(二)灌溉建議。本區(qū)域易出現(xiàn)季節(jié)性干旱,尤其春旱多發(fā)、常發(fā)。要密切關注天氣變化,當耕層5cm地溫連續(xù)5天穩(wěn)定在10℃—12℃,且5—10cm土壤相對含水量75%—85%時搶墑播種。田間基礎設施較好、有灌溉條件的農田,灌溉玉米可采取淺埋滴灌干播濕出等技術措施,造墑播種,一播全苗。墑情過多地塊,要及時排澇降漬、散墑增溫。在春玉米拔節(jié)期、抽雄期、灌漿期土壤相對含水量低于60%、65%、65%時應及時補灌。旱地玉米可推廣抗旱坐水種、深開溝淺覆土播種、明溝深種等技術,配套保水劑拌肥混勻底施、覆蓋保墑及合理密植措施,促進抗旱保苗。
(三)節(jié)灌措施。本區(qū)域灌區(qū)可采取以下節(jié)水補灌措施:
一是“一條龍”抗旱坐水種。播種時,利用
拖拉機帶動抗旱水箱進行補水,畝灌水3—5方。
二是采用軟管(小白龍)輸水補灌。順著玉米壟溝隔溝補灌,一次灌溉3—5壟,每次灌水30—50方/畝,結合灌溉追肥。
三是淺埋滴灌。播種后立即滴灌出苗水10—15方/畝,此后根據(jù)土壤墑情在春玉米拔節(jié)期、抽雄期、灌漿期少量多次補灌,每次滴水15—20方/畝。根據(jù)玉米需肥規(guī)律隨灌溉追施水溶肥,促進水肥耦合,提高水肥利用效率和玉米產(chǎn)量。
遼河流域平原灌區(qū)
(一)基本情況。本區(qū)域包括內蒙古西遼河灌區(qū)、遼寧中部、吉林中南部。3月中旬以來該區(qū)域大部溫度偏高0℃—2℃,降水偏多1—2倍,局地偏多2—4倍,0—20cm土壤相對含水量75%—85%,墑情整體適宜,遼寧中部及吉林中南部局地墑情過多。
(二)灌溉建議。本區(qū)域地下水資源匱乏,超采嚴重。灌區(qū)應以高效節(jié)水灌溉為核心,大力推廣淺埋滴灌,配套水肥一體化技術,促進水肥耦合。目前墑情較好,光溫適宜,應加快播種進度,在5—10cm土壤相對含水量75%—85%時搶墑播種。墑情不足或干旱地塊可在播種后灌1次出苗水,滴水齊苗。苗期墑情較好可不灌水,并結合中耕以促根下扎。6月中旬開始灌水,之后在玉米拔節(jié)期、抽雄期、灌漿期土壤相對含水量低于70%時及時灌溉。在玉米拔節(jié)前,在行間深松30—35cm,充分納蓄雨水。旱地應以保墑為核心,推廣高強度地膜、全生物降解地膜覆蓋,保水劑拌肥底施,覆膜地塊要把薄膜壓緊壓實,防止大風揭膜。
(三)節(jié)灌措施。本區(qū)域主要為井灌區(qū),田間節(jié)水灌溉工程設施較好,灌溉保證率較高,可采用以下節(jié)水灌溉措施:一是淺埋滴灌。播種后滴灌出苗水10—15方/畝,此后在土壤墑情不足時進行補灌,每次滴水15—25方/畝,結合灌溉追施水溶肥,提高水肥利用效率和產(chǎn)量。二是軟管(小白龍)輸水灌溉。沿玉米壟溝進行灌溉,每次灌水30—50方/畝,結合灌溉追肥。三是小畦灌溉。應做到畦田平整,每次灌水40—50方/畝。
華北北部春玉米種植區(qū)
(一)基本情況。本區(qū)域包括河北北部、山西中北部、內蒙古燕山丘陵區(qū)和遼寧西部。去年入冬以來,該區(qū)域有效降水偏少,氣溫偏高,春季溫高風大,土壤失墑較快,目前部分地區(qū)土壤墑情不足。
(二)灌溉建議。本區(qū)域水資源匱乏,十年九旱,春旱、夏伏旱時有發(fā)生。灌區(qū)重點推廣膜下滴灌、淺埋滴灌水肥一體化技術,配套適當密植,做好化控防倒伏。本區(qū)域可采用“秋深松+春旋耕”結合方式精細整地,提高蓄水保墑能力和灌溉均勻度,但不適合砂地和低洼地等特殊地塊。4月下旬以后待耕層5—10cm地溫穩(wěn)定通過10℃后播種。旱區(qū)要以蓄水保墑為核心,重點推廣保水劑、坐水種、深松耕+長效肥、地膜覆蓋等集雨抑蒸保墑技術。
(三)節(jié)灌措施。本區(qū)域主要為井灌區(qū)和河灌區(qū),可采用膜下滴灌、淺埋滴灌、噴灌和微噴灌等高效節(jié)水灌溉技術,根據(jù)土壤墑情、降水情況和玉米需水規(guī)律少量多次補充灌溉。播種后2天內灌出苗水,濕潤地塊灌水10—15方/畝,干燥地塊灌水15—25方/畝。苗期一般不灌水,可中耕鋤劃促根下扎,提高玉米抗旱能力。拔節(jié)至灌漿期當0—40cm土壤相對含水量低于70%及時滴灌,每次灌15—25方/畝,全生育期一般灌溉5—7次。結合灌溉和玉米需肥規(guī)律追施水溶肥,促進水肥耦合。
西北春玉米種植區(qū)
(一)基本情況。本區(qū)域包括內蒙古西部、陜西、甘肅、青海、寧夏、新疆春玉米種植區(qū)。目前大部分區(qū)域0—20cm土壤相對含水量為65%—75%,墑情適宜;內蒙古西部、甘肅隴中和陜西陜北局地、寧夏南部0—20cm土壤相對含水量低于65%,墑情不足。
(二)灌溉建議。本區(qū)域水資源匱乏,十年九旱。灌區(qū)玉米以高效節(jié)水灌溉為核心,重點推廣玉米淺埋滴灌和膜下滴灌水肥一體化技術創(chuàng)高產(chǎn)。旱區(qū)大力重點推廣集雨補灌、保水劑拌肥底施、加厚膜和全生物降解地膜覆蓋等旱作節(jié)水技術。未播種地塊應加快播種進度,趁墑情適宜搶墑播種。灌區(qū)墑情不足地塊,可采用干播濕出技術,播后及時補灌出苗水。拔節(jié)期、抽雄期、灌漿期和成熟期土壤相對含水量分別低于60%、65%、70%和65%時及時灌溉,結合灌水追肥。旱地玉米可在大喇叭口期充分利用集雨設施集蓄雨水,將肥料溶解在水中用注肥槍將肥液注射在根系附近,補水補肥;也可葉面噴施含鋅水溶肥,提高結實率和穗粒數(shù)。
(三)節(jié)溉措施。本區(qū)域灌區(qū)主要為渠灌和井灌混合灌區(qū),可采用以下節(jié)水灌溉措施:一是膜下滴灌和無膜淺埋滴灌,播種后,滴灌出苗水10—20方/畝。此后,根據(jù)土壤墑情和玉米需水規(guī)律進行滴溉,少量多次,全生育期滴水11—12次,間隔時間8—12天,每次滴水量20—30方/畝,滴水總量250—300方/畝,結合灌水追施滴灌專用肥或其他速效肥。二是小畦灌,每個小畦約0.5畝,畦面相對高差不大于3cm,每次灌水50—60方/畝,全生育期灌水6—7次,灌水總量340—360方/畝。三是壟膜溝灌,每次灌水約50方/畝,全生育期灌水6—7次,灌水總量300—350方/畝。杜絕大水漫灌。
西南春玉米種植區(qū)
(一)基本情況。本區(qū)域包括云南、貴州、四川等春玉米種植區(qū)。目前大部土壤墑情適宜,四川北部、云南中部和北部、貴州南部局地土壤相對含水量低于65%,墑情不足。
(二)灌溉建議。本區(qū)域水資源相對豐富,河、塘等較多,但降水時空分布不均,農田灌溉基礎設施不足,春旱、夏伏旱時有發(fā)生。旱地要以蓄水保墑為核心,重點推廣保水劑、覆蓋保墑等抗旱節(jié)水措施。有補灌條件的地塊,以節(jié)水增效增產(chǎn)為核心,推廣滴灌水肥一體化技術進行灌溉施肥。
(三)灌排措施。本區(qū)域主要為雨養(yǎng)區(qū),有水源條件的可利用河水或水塘,采用滴灌技術進行少量多次灌溉,結合土壤墑情每次畝滴水15—20方,全生育期一般灌5—7次。結合灌溉和玉米需肥規(guī)律追施水溶肥,促進水肥耦合。降水偏多易出現(xiàn)漬澇的地塊,雨季來臨時應及時清溝排水,排澇降漬。
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