霜降,這一節氣為大家帶來了初冬的氣息。霜降正處於秋冬過渡期,隨著霜降的到來,天氣變化幅度較大,逐漸變冷、開始降霜。黃河以北的大地上草木葉片枯黃凋落,蟄蟲在洞中垂下頭來進入冬眠狀態;而長江中下遊及以南的地區霜降期間氣候尚溫和,平均氣溫多在16℃左右,田疇青蔥,橙黃橘綠,秋菊競放,芙蓉盛開。
霜降也是重要的農作時期,在全國各地流傳著很多關於這一節氣的農諺。湖南有“十月寒露霜降到,收割晚稻把薯刨”,江蘇有“寒露無青稻,霜降一齊倒”,安徽有“寒露收割罷,霜降把地翻”。說明霜降節氣是大秋作物最後完成收獲的時節。
霜shuang降jiang後hou全quan國guo北bei方fang廣guang大da地di區qu的de農nong田tian土tu壤rang,該gai種zhong的de已yi經jing種zhong上shang了le,部bu分fen農nong地di將jiang處chu於yu冬dong閑xian時shi段duan。對dui於yu這zhe些xie農nong田tian土tu壤rang如ru何he管guan理li好hao呢ne?目mu前qian有you兩liang種zhong做zuo法fa,由you此ci也ye會hui有you兩liang種zhong效xiao果guo。其qi一yi是shi用yong地di與yu養yang地di相xiang結jie合he,大da秋qiu後hou采cai用yong人ren工gong強qiang化hua養yang地di手shou段duan,多duo途tu徑jing促cu進jin農nong田tian物wu質zhi循xun環huan,在zai用yong地di的de間jian隙xi中zhong及ji時shi恢hui複fu與yu提ti高gao地di力li,使shi土tu壤rang環huan境jing穩wen定ding,最zui終zhong農nong田tian的de土tu壤rang肥fei力li和he生sheng產chan力li得de到dao改gai善shan和he提ti高gao。其qi二er是shi與yu此ci相xiang反fan,不bu適shi當dang地di利li用yong土tu壤rang,不bu采cai取qu有you利li的de耕geng作zuo培pei肥fei措cuo施shi,致zhi使shi土tu壤rang汙wu染ran漸jian重zhong,次ci生sheng鹽yan漬zi化hua發fa展zhan,地di力li不bu斷duan退tui化hua,從cong而er降jiang低di了le農nong田tian土tu壤rang的de肥fei力li和he生sheng產chan能neng力li。為wei此ci,要yao提ti倡chang第di一yi種zhong觀guan念nian和he做zuo法fa,並bing具ju體ti介jie紹shao以yi下xia以yi土tu壤rang基ji本ben耕geng作zuo和he施shi有you機ji肥fei相xiang結jie合he的de兩liang項xiang技ji術shu:
對收獲了大豆、棉花、甘gan薯shu等deng秋qiu作zuo物wu的de農nong田tian,進jin行xing深shen度du耕geng翻fan。這zhe種zhong基ji本ben土tu壤rang耕geng作zuo的de作zuo用yong大da,持chi續xu時shi間jian長chang,不bu同tong於yu作zuo物wu生sheng長chang期qi間jian的de表biao土tu耕geng作zuo,其qi作zuo用yong小xiao,持chi續xu時shi間jian短duan。耕geng翻fan是shi通tong過guo犁li鏵hua等deng農nong具ju耕geng翻fan深shen度du土tu壤rang的de措cuo施shi,可ke改gai變bian土tu壤rang的de物wu理li構gou造zao,影ying響xiang土tu層ceng的de水shui分fen分fen布bu,對dui水shui、肥、氣、熱的比例具有調節作用。由於作物收獲後的土壤緊實、guxiangbilida,gengfankeyigaishangengcenggouzao,jianlishiyuzuowushengchangdegengcenggouzao。biaoxianzaigaishanturangtongqixing,youliyuzhongzifaya,jianshaozuowugenxishengchangdezuli,zengqianggenxihuoli;耕翻後土壤有利於蓄水保墒,蓄儲降雨水,保住土中墒,減少蒸發、徑流和滲漏,發揮土壤作為“小水庫”的作用,增強春季農田抗旱能力;耕翻把下層不良性狀的土壤翻到地表,借助於幹濕和凍融的自然之力,熟化土壤的耕層厚度;同tong時shi耕geng翻fan可ke以yi掩yan埋mai殘can茬cha,再zai結jie合he深shen施shi有you機ji肥fei,使shi土tu肥fei相xiang融rong,逐zhu步bu提ti高gao土tu壤rang肥fei力li。尤you其qi對dui於yu質zhi地di黏nian重zhong或huo有you黏nian著zhe障zhang礙ai層ceng的de土tu壤rang,通tong過guo耕geng翻fan和he施shi有you機ji肥fei可ke以yi明ming顯xian改gai善shan結jie構gou,有you利li於yu作zuo物wu紮zha根gen生sheng長chang;duiyuchangqiyanshuidenongtian,turangwulixingzhuangbuliang,gengfankeyigaishanchangqiyanshuisuoxingchengdeqianyuceng,cujinyanghua,jianshaohaiyuanxingyouhaiwuzhidejilei,youliyuturangdejiankang。
土(tu)壤(rang)耕(geng)翻(fan)要(yao)結(jie)合(he)全(quan)層(ceng)施(shi)用(yong)有(you)機(ji)肥(fei)料(liao)。全(quan)國(guo)農(nong)田(tian)土(tu)壤(rang)的(de)有(you)機(ji)質(zhi)含(han)量(liang)普(pu)遍(bian)不(bu)高(gao),必(bi)須(xu)重(zhong)視(shi)有(you)機(ji)肥(fei)料(liao)的(de)合(he)理(li)施(shi)用(yong)。有(you)機(ji)肥(fei)料(liao)除(chu)了(le)提(ti)供(gong)適(shi)量(liang)的(de)無(wu)機(ji)、有you機ji養yang分fen以yi外wai,其qi分fen解jie後hou的de產chan物wu更geng新xin腐fu殖zhi質zhi,形xing成cheng微wei團tuan聚ju體ti改gai善shan土tu壤rang性xing狀zhuang,提ti高gao土tu壤rang肥fei力li。土tu壤rang微wei團tuan聚ju體ti對dui自zi身shen和he施shi入ru的de水shui分fen及ji營ying養yang物wu質zhi具ju有you較jiao大da的de吸xi儲chu能neng力li、釋供能力和轉化能力,同時也有較大的緩衝能力,土壤具有適宜的微團聚體對於調節土壤中水、肥、氣、熱以及緩衝性能都起著重要的作用。有機肥料的施用還能加強土壤酶的活性,土壤酶的活性增強,能提高土壤肥力。
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