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关于印发《南方双季稻抢收抢种机械化生产技术指导意见》的通知

2022-07-18 09:32:45 来源:农业农村部农机化总站 阅读量:19307 评论

导读:农业农村部农机化总站联合农业农村部农作物生产全程机械化专家指导组制定了《南方双季稻抢收抢种机械化生产技术指导意见》。

  农机化总站[2022]79号
 
  各有关单位:
 
  为贯彻落实《农业农村部办公厅关于做好水稻“双抢”机械化生产工作的通知》,我站联合农业农村部农作物生产全程机械化专家指导组制定了《南方双季稻抢收抢种机械化生产技术指导意见》,现印发给你们。请结合实际,细化技术方案,完善工作措施,加强“双抢”期间技术培训指导,促进高质高效完成早稻机收、晚稻机种机械化生产工作。
 
  农业农村部农业机械化总站
 
  2022年7月15日
 
  南方双季稻抢收抢种机械化生产技术
 
  指导意见
 
  农业农村部农业机械化总站
 
  农业农村部农作物生产全程机械化
 
  专家指导组
 
  当前,正值南方早稻灌浆结实、双季晚稻育秧关键期,即将进入双季稻的抢种抢收季节,为做好双季晚稻育秧管理,提高育插秧质量,及早做好早稻机收准备,完善防灾减灾机械化技术方案,实现减损收获、颗粒归仓,制定南方双季稻抢收抢种机械化生产技术指导意见,供各地参考。
 
  一、晚稻秧苗管理
 
  (一)秧苗管理
 
  培育适龄壮秧是移栽水稻稳产高产的基础,晚稻秧苗生长正值高温高湿季节,尤其要注意控温控湿,防止秧苗生长过快,造成苗细苗弱。采用大田育秧,可搭建育秧棚,覆盖遮阳网或无纺布,防止高温暴晒、大雨冲刷和雀害鼠害,避免秧苗不齐不匀。水分管理应实现旱育状态,保持秧板土壤湿润和供氧充足,应及时揭遮阳网或无纺布。根据水稻品种与机插秧龄情况,必要时可酌情叶面喷施多效唑、烯效唑等生长调节剂控制生长,具体用法用量参照使用说明书。移栽前3—4天,天晴灌半沟水蹲苗,或放水炼苗;移栽前对秧苗喷施一次对口农药,做到带药栽插,以便有效控制大田活棵返青期的病虫害。
 
  (二)适机秧苗
 
  适宜机插秧的壮秧标准为:根系发达、苗高适宜、茎基部粗壮、叶挺色绿、青秀无病、均匀整齐;根系短、白、粗、多,盘结牢固,提起不散;晚稻叶龄3.5—4.5叶,苗高12—22cm,秧龄15—20天;移栽后发根快、抗逆性强,能够早扎根、早活棵、早分蘖。
 
  有序抛秧、钵体毯状苗机插、钵苗摆栽等水稻机械化移栽技术模式,能够增强晚稻抵御寒露风等灾害天气能力,减少除草剂施用,缓解双季稻种植茬口紧张,具有较大的增产潜力。应根据各地气候、土壤、地貌等条件,因地制宜选择适用技术路线,注意各模式在育秧方式、秧苗管理、机械准备、插(抛)秧要求等方面的技术差异,按照“为机育秧”理念,培育适宜机械化作业的秧苗,并不断促进技术熟化和应用简化,降低生产成本,持续扩大应用面积。
 
  二、早稻减损收获
 
  (一)适期机收
 
  当早籼稻谷粒全部变硬,90%以上籽粒谷壳及穗轴、枝梗转黄时即可进行机械收获,防止割青。根据不同田块选择合适的收获机,选择晴好天气,及时收割。遇连阴雨或洪涝灾害,应及时抢收,避免出现“穗发芽”。联合收获应在雨、露水基本消退后作业;分段收获应在完熟前4—5天收割,适时脱粒。
 
  (二)机械准备
 
  应选用带茎秆切碎和抛洒装置的收获机作业,便于秸秆还田和埋茬作业。作业前应对收获机械进行检查、调试、维修和保养,保证机械性能良好。同时,应做好田间杂物清除,并根据收割方式开出收割道。
 
  (三)技术要求
 
  开始收割水稻或更换收割品种时应进行试割,试割长度10—15米,按照作业质量标准仔细检测试割效果(检测损失率、含杂率和破碎率等),对相应工作部件(风机进风口开度、振动筛筛片角度、凹板间隙、拨禾轮位置、喂入深浅等)适当调整。调整后,应再次试割检测,直至达到作业质量标准。
 
  作业路径一般选用向心回转法。作业时应根据水稻的品种、株高、产量、成熟度及秸秆含水率等因素选择适宜的作业前进速度,通过前进速度、割茬高度及割幅宽度来调整喂入量,使机器在正常负荷下工作,避免夹带损失增加及产生堵塞故障。作业时应保持发动机在额定转速、机器直线行驶状况下作业,避免边割边转弯,以防压倒稻穗造成漏割,增加损失。
 
  对倒伏水稻收割,可通过安装“扶倒器”和“防倒伏弹齿”装置,提高对倒伏水稻的收获适用性。收割倒伏水稻时,应先放慢作业速度,将割台降至适宜高度,原则上倒伏角小于45度时采取顺割;倒伏角45—60度时采取逆割;在倒伏角大于60度时一般不宜机收,如采用机收,应降低收割速度,并将割台放置最低位置。
 
  对再生稻头季稻收割,应调控放水晒田时机,提高收获时稻田土壤坚实度,降低机具碾压对水稻植株的影响,提升机具通过性;在传统履带式谷物联合收获机遴选适宜机型基础上调整改造,采用加宽割幅、减窄履带等方式降低直行碾压率;做好路径规划和驾驶操作技能提升,减少地头转弯碾压次数和比例,合理抛洒秸秆,减少稻桩掩埋,最大限度提升再生稻再生季萌发分蘖能力。
 
  采取分段收获方式,割晒时,应铺放整齐、不塌铺、不散铺,穗头不着地,防止干湿交替、增加水稻径纹粒和降低品质。捡拾作业时,宜在水稻割铺后晾晒3—5天、稻谷水分降至16%左右时捡拾,应不压铺,不丢穗,捡拾干净。
 
  水稻收获作业质量要求:全喂入水稻联合收割机总损失率≤3.5%,破碎率≤2.5%,含杂率≤2.5%;半喂入水稻联合收割机总损失率≤2.5%,破碎率≤1.0%,含杂率≤2.0%;割晒机收割水稻应铺放整齐、位置正确、无漏割,损失率<1%。
 
  三、稻谷机械烘干
 
  (一)技术要点
 
  稻谷收获后应及时用谷物烘干机烘干至标准含水量(籼稻13.5%,粳稻14.5%),减少霉变,提升品质;不能及时干燥的稻谷,应采用仓内通风、地上笼通风或晾晒方式。稻谷烘干前应进行初清,含杂率≤2%,不得有长茎秆、麻袋绳、塑料薄膜等杂物。烘干前,需测定稻谷的初始含水率,同一批烘干的稻谷含水率差异≤3%,含水率差异大的稻谷最好应分别进行烘干;当稻谷水分差大于3%—6%,应进行冷风循环干燥到水分差不大于3%时开始干燥;当稻谷水分差大于3%且稻谷水分大于26%,应边进湿稻谷边通冷风循环干燥,直到机内稻谷水分差不大于3%且稻谷水分不大于26%时开始干燥。循环式烘干机干燥工艺:多次干燥→缓苏→冷却,烘干稻谷受热温度:早籼稻≤48℃、粳稻≤40℃;最高热风温度:早籼稻55—70℃、粳稻53—65℃,循环式横流干燥机取偏下限温度,循环式混流干燥机取偏上限温度。采取短时间加热干燥长时间缓苏,干燥缓苏比为1:3—1:7,要控制干燥速率不大于1.5%/h,防止增大爆腰率。
 
  优先采用不落地及时干燥工艺,即稻谷收获后,不在地上堆放,直接清选尽快烘干。当环境温度大于25℃、稻谷水分大于24%时,收获后10小时内进行烘干,气温越高或水分越大,应越短时间内进行烘干,湿稻谷应第一时间烘干。
 
  (二)机具选配
 
  谷物烘干机根据烘干批次、生产规模配置,一般选用低温循环式烘干机,宜选用燃气、生物质、热泵等环保热源,优先选用热泵烘干机。机械化烘干作业应遵循就近烘干原则,提前联系社会化服务组织,做好批次安排,科学合理拉运,避免湿稻谷长期堆放。
 
  四、大田机械耕整
 
  (一)技术要点
 
  早稻收割后应及时进行耕整,晚稻机插耕整地质量应做到“平整、洁净、细碎、沉实”。耕整深度均匀一致,田块平整,地表高低落差不大于3cm;田面洁净,无残茬、杂草等杂物;土层下碎上糊,上烂下实;田面泥浆沉实达到泥水分清,寸水不露泥,沉实而不板结,机械作业时不陷机、不壅泥。
 
  为了提升地力,提倡实施秸秆还田。实施秸秆还田田块,在早稻收获时,应使用具有切碎及均匀抛撒装置的收获机,秸秆切碎长度≤10cm,割茬高度以不影响耕整地质量为宜,一般≤15cm;若采取高留茬收获,在耕作前应再增加一遍秸秆粉碎还田作业,以提高秸秆还田质量;应增施氮肥、减少磷钾肥用量,以每100kg秸秆增施纯氮1kg,宜选择铵态氮或尿素,提倡有机肥、无机肥相结合,在机具作业前,均匀撒施在秸秆残体上。
 
  秸秆还田地块耕整地作业时,应根据田块的具体形状确定作业路线,应尽量避免或减少重耕、漏耕及小角度转弯,一般作业两遍,第一遍宜慢,第二遍速度可稍快,两遍作业应纵横交叉作业。可采用大、中功率拖拉机配套加大耕深的旋耕机或铧式犁耕翻,一般翻耕深度18—22cm,旋耕深度12—16cm,秸秆还田作业耕深控制在16—20cm,连续2年以上旋耕地块宜适当加大耕深;翻耕或旋耕应结合施用有机肥及其它基肥,使肥料翻埋入土,与土层混合。应采用水田耙或平地打浆机平整田面,沉实后达到机插耕整地质量要求。
 
  (二)机具选配
 
  双季稻区茬口紧,在早稻收获后应及时耕整地,作业时宜选用橡胶履带式农业机械,禁止90及以上马力轮式拖拉机开展水田机械化作业,降低接地比压,减少水田犁底层的破坏;配套机具可选用反转灭茬旋耕机、旋耕机、铧式犁、水田埋茬起浆机、水田耙、平地打浆机等。
 
  五、晚稻机械栽插
 
  (一)秧苗准备
 
  根据机插时间与进度安排起秧时间。秧盘起秧时,先拉断穿过盘底渗水孔的少量根系,连盘带秧一并提起,再平放,然后小心卷苗脱盘,提倡采用秧苗托盘及运秧架运秧。秧苗运至田头时应随即卸下平放,使秧苗自然舒展;做到随起随运随插,尽量减少秧块搬动次数,避免运送过程中挤、压伤秧苗、秧块变形及折断秧苗。运到田间的待插秧苗,严防烈日照晒伤苗,应采取遮荫措施防止秧苗失水枯萎。
 
  (二)机械准备
 
  插秧前应先检查调试插秧机,按照插秧机使用说明书调整插秧机的栽插株距、取秧量和栽插深度,转动部件应加注润滑油,并进行5—10分钟的空运转,插秧机各运动部件应转动灵活,无碰撞卡滞现象,以确保插秧机能够正常工作。装秧苗前须将秧箱移动到导轨的一端(使秧爪从秧片端头开始取秧栽插),再装秧苗,避免漏插。秧块应紧贴秧箱,不拱起,两片秧块接头处应对齐,不留间隙,必要时秧块与秧箱间要洒水润滑秧箱面板,使秧块下滑顺畅。
 
  (三)机插要求
 
  根据水稻品种、栽插季节、秧盘规格选择适宜类型的插秧机,提倡采用高速插秧机作业,提高工效和栽插质量。机插栽插时,秧苗均匀,深浅一致,漏插率≤5%,伤秧率≤4%,漂秧率≤3%,插秧深度在1—3cm,以浅栽为宜,有利于低节位分蘖。
 
  根据水稻品种及栽插季节选择适宜栽插密度。常规稻株距12—16cm,每穴3—5株,种植密度1.4—1.9万穴/亩;杂交稻株距14—17cm,每穴1—3株,种植密度1.3—1.6万穴/亩。有条件的地区及专业合作社可采用同步侧深施肥插秧机作业,以提高肥效。
 
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