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2021年绿色种养循环农业试点技术指导意见

2021-07-05 09:02:10 来源:农业农村部种植业管理司 阅读量:19635 评论

导读:为做好2021年绿色种养循环农业试点,打通种养循环堵点,推动“粪污”变“粪肥”,促进有机肥科学合理施用,制定技术指导意见如下。

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  为做好2021年绿色种养循环农业试点,打通种养循环堵点,推动“粪污”变“粪肥”,促进有机肥科学合理施用,制定技术指导意见如下。
 
  一、基本原则
 
  (一)生产与生态兼顾。增加有机肥投入,改善施肥结构,促进高产稳产。考虑环境承载量,就地就近施用粪肥,实现循环利用,减轻面源污染。
 
  (二)减量与增效协同。用有机养分替代部分化学养分,减少化肥用量。强化有机无机结合,提升肥料利用效率和耕地地力水平。
 
  (三)安全与有效并重。满足畜禽粪便无害化处理要求,确保发酵腐熟,保证安全施用。强化粪肥施用指导,合理确定用量,优化施肥方式,提高应用效果。
 
  二、技术指标
 
  (一)堆肥质量指标。堆肥中期高温维持50—60℃,条垛式不少于15天,槽式不少于7天。腐熟后堆体呈黑褐色,一般呈弱碱性,不再产生臭味,不吸引蚊蝇。
 
  (二)安全监测指标。堆肥过程中应进行不少于1次抽检,检查堆肥腐熟度;施用前应参照相关肥料抽查技术规程进行1次抽检,检测堆肥是否腐熟完全,相关有毒有害限量指标是否符合《有机肥料》(NY/T525-2021)要求。
 
  (三)施用技术指标。结合本地实际和有机肥替代化肥相关试验成果,科学确定不同作物有机肥使用量、时间和方法。一般堆肥亩施用量1000—2000公斤、沼渣2000—3000公斤、商品有机肥300—800公斤。
 
  三、关键技术
 
  (一)堆肥还田。以畜禽粪便为原料,根据堆肥场地条件、生产规模需求等采用条垛、槽式等方式堆肥。控制含水量45%—65%、碳氮比20:1—40:1、pH为5.5—9.0,按堆肥物料质量的0.1%-0.2%接种有机物料腐熟剂。按照《畜禽粪便堆肥技术规范》(NY/T3442-2019)要求,堆肥中期高温并持续,温度较低区域适当延长维持时间,实现充分腐熟。堆肥施用量一般1000—2000公斤/亩,采用撒施、条施、沟施、穴施等方式。宜在秋季或播种(移栽)前作基肥施用,避开雨季,施入后24小时内翻耕入土。
 
  (二)沼渣还田。根据沼气发酵技术要求,利用畜禽粪便进行发酵和无害化处理,后经干湿分离,将沼渣用于农田。腐熟的沼渣一般作基肥,用量2000—3000公斤/亩,采用撒施、条施、穴施等方式,及时翻耕覆土。水田均匀撒施后翻耕入土10厘米左右,旱地采用穴施、沟施,然后覆土。不宜与草木灰等碱性肥料混施。
 
  (三)沼液还田。分离沼渣后的沼液一般作追肥,采用条施、穴施、环状施肥和喷灌、滴灌、叶面喷施等方式,及时覆土。沼液施用应根据养分含量和作物特点适当稀释,微灌施用时注意过滤,避免堵塞管道和滴头。沼液可浸种,使用前稀释,浸泡后的种子沥干后用清水洗净。
 
  (四)商品有机肥施用。以畜禽粪便为原料生产商品有机肥,质量应符合《有机肥料》(NY/T525-2021)要求。可作基肥,采用穴施、沟施、环状施肥等方式集中施用,用量一般300—800公斤/亩,注意与化肥配合施用。施用时与植株根系保持一定距离,在两行作物中间沟施或株间穴施。作种肥时采用条施、点施和穴施等方式,可与化肥混合,随机械播种施入土壤,避免与碱性肥料或杀菌剂同时施用。
 
  四、注意事项
 
  (一)把好堆肥质量关。规范养殖环节,严格饲料添加剂标准,降低重金属、氮、抗生素等投入,让畜禽吃的安全,从源头控制粪肥利用风险。要规范处理环节,加强堆肥积造过程质量控制,注意清除塑料、玻璃、金属、石块等杂物,定期监测堆肥、沼液发酵程度。施用前定期抽样检测,确保安全。
 
  (二)强化合理施用。以《畜禽粪便还田技术规范》(GB/T25246-2010)、《肥料合理使用准则 有机肥料》(NY/T1868-2021)为指引,科学合理确定粪肥施用的数量、时间和方法,避免过量和过于集中施用。在施用腐熟度较低的粪肥时,避开作物根系,配合施用化肥和石灰,避免烧苗烧根、病虫草害等现象。
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