農作物種子的分類
農(nong)作物(wu)種(zhong)(zhong)(zhong)(zhong)子(zi)可分(fen)為(wei)有胚乳(ru)(ru)種(zhong)(zhong)(zhong)(zhong)子(zi)和(he)無胚乳(ru)(ru)種(zhong)(zhong)(zhong)(zhong)子(zi),有胚乳(ru)(ru)種(zhong)(zhong)(zhong)(zhong)子(zi)由種(zhong)(zhong)(zhong)(zhong)皮、胚和(he)胚乳(ru)(ru)組(zu)成,包括蓖(bi)麻、煙草(cao)、西(xi)紅柿、柿、小(xiao)麥、水稻(dao)、玉米、高(gao)粱(liang)和(he)洋蔥等(deng)植(zhi)物(wu)的種(zhong)(zhong)(zhong)(zhong)子(zi);無胚乳(ru)(ru)種(zhong)(zhong)(zhong)(zhong)子(zi)包括大豆、落(luo)花生、棉、油菜、瓜類、慈姑、澤(ze)瀉(xie)等(deng)的種(zhong)(zhong)(zhong)(zhong)子(zi)。
農作物種子檢驗規程
農作(zuo)物(wu)種子(zi)檢驗(yan)規程由扦(qian)樣、檢測(ce)和結果(guo)報告(gao)(gao)三(san)個方面的(de)內容組成。扦(qian)樣是從大量(liang)的(de)種子(zi)中,隨機取(qu)得(de)一(yi)個重量(liang)適當,有代表性的(de)供(gong)檢樣品(pin),檢測(ce)部分(fen)包括(kuo)種子(zi)的(de)外在(zai)品(pin)質(凈度、發芽率、水分(fen)含量(liang)、生活力、重量(liang)和健康狀況)和內在(zai)品(pin)質(真(zhen)實(shi)性和品(pin)種純度)的(de)檢測(ce)。結果(guo)報告(gao)(gao)是對種子(zi)的(de)質量(liang)檢驗(yan)報告(gao)(gao)。
如何選購種子
購買種子首先要問清楚生產日期,放置過久的種子可能變質不利于發芽生長;其次要根據土壤的性質、環境溫度、生長的溫度等環境因素選擇合適的種子,注意看種子的說明書,最后注意選購的種子品牌,以發芽率高、顆粒飽滿的種子(zi)為宜(yi),注(zhu)意(yi)不要買到(dao)假種子(zi)。
種子的傳播方式有幾種
植物(wu)種(zhong)子的傳(chuan)(chuan)(chuan)(chuan)播(bo)(bo)(bo)方式有(you):①風力傳(chuan)(chuan)(chuan)(chuan)播(bo)(bo)(bo):依(yi)(yi)靠(kao)(kao)風來傳(chuan)(chuan)(chuan)(chuan)播(bo)(bo)(bo)種(zhong)子;②水力傳(chuan)(chuan)(chuan)(chuan)播(bo)(bo)(bo):依(yi)(yi)靠(kao)(kao)水流傳(chuan)(chuan)(chuan)(chuan)播(bo)(bo)(bo)種(zhong)子;③動物(wu)傳(chuan)(chuan)(chuan)(chuan)播(bo)(bo)(bo):依(yi)(yi)靠(kao)(kao)動物(wu)傳(chuan)(chuan)(chuan)(chuan)播(bo)(bo)(bo)種(zhong)子;④自體傳(chuan)(chuan)(chuan)(chuan)播(bo)(bo)(bo):依(yi)(yi)靠(kao)(kao)植物(wu)自身傳(chuan)(chuan)(chuan)(chuan)播(bo)(bo)(bo)種(zhong)子。
種子是由什么發育而來的
胚珠(zhu)發(fa)育成(cheng)(cheng)種子,受精卵發(fa)育成(cheng)(cheng)胚,子房發(fa)育成(cheng)(cheng)果(guo)實,珠(zhu)被發(fa)育成(cheng)(cheng)種皮(pi),子房壁發(fa)育成(cheng)(cheng)果(guo)皮(pi)。