農作物種子的分類
農(nong)作物種(zhong)(zhong)子(zi)可分為有胚乳(ru)種(zhong)(zhong)子(zi)和無胚乳(ru)種(zhong)(zhong)子(zi),有胚乳(ru)種(zhong)(zhong)子(zi)由種(zhong)(zhong)皮、胚和胚乳(ru)組成,包(bao)括蓖麻、煙草、西紅柿(shi)、柿(shi)、小麥、水稻、玉(yu)米、高粱和洋蔥等植物的種(zhong)(zhong)子(zi);無胚乳(ru)種(zhong)(zhong)子(zi)包(bao)括大豆、落(luo)花生(sheng)、棉(mian)、油菜、瓜類、慈姑、澤瀉等的種(zhong)(zhong)子(zi)。
農作物種子檢驗規程
農(nong)作物種(zhong)(zhong)(zhong)子(zi)(zi)檢(jian)驗規程由扦樣(yang)(yang)、檢(jian)測和(he)結果報告三個方面的內容組成。扦樣(yang)(yang)是(shi)從(cong)大量的種(zhong)(zhong)(zhong)子(zi)(zi)中,隨機取得一個重量適(shi)當,有代(dai)表性的供檢(jian)樣(yang)(yang)品(pin)(pin),檢(jian)測部分(fen)包括種(zhong)(zhong)(zhong)子(zi)(zi)的外在品(pin)(pin)質(zhi)(凈度(du)、發芽率、水(shui)分(fen)含(han)量、生(sheng)活力、重量和(he)健康狀況)和(he)內在品(pin)(pin)質(zhi)(真實性和(he)品(pin)(pin)種(zhong)(zhong)(zhong)純(chun)度(du))的檢(jian)測。結果報告是(shi)對種(zhong)(zhong)(zhong)子(zi)(zi)的質(zhi)量檢(jian)驗報告。
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(de)種子(zi)為(wei)宜,注意不要買到(dao)假種子(zi)。
種子的傳播方式有幾種
植(zhi)物(wu)(wu)種(zhong)子的(de)傳(chuan)(chuan)播(bo)(bo)(bo)方式有(you):①風力傳(chuan)(chuan)播(bo)(bo)(bo):依(yi)靠風來傳(chuan)(chuan)播(bo)(bo)(bo)種(zhong)子;②水(shui)力傳(chuan)(chuan)播(bo)(bo)(bo):依(yi)靠水(shui)流傳(chuan)(chuan)播(bo)(bo)(bo)種(zhong)子;③動物(wu)(wu)傳(chuan)(chuan)播(bo)(bo)(bo):依(yi)靠動物(wu)(wu)傳(chuan)(chuan)播(bo)(bo)(bo)種(zhong)子;④自體傳(chuan)(chuan)播(bo)(bo)(bo):依(yi)靠植(zhi)物(wu)(wu)自身傳(chuan)(chuan)播(bo)(bo)(bo)種(zhong)子。
種子是由什么發育而來的
胚(pei)珠(zhu)(zhu)發(fa)育成(cheng)(cheng)種子(zi),受精卵發(fa)育成(cheng)(cheng)胚(pei),子(zi)房(fang)(fang)發(fa)育成(cheng)(cheng)果實,珠(zhu)(zhu)被(bei)發(fa)育成(cheng)(cheng)種皮,子(zi)房(fang)(fang)壁發(fa)育成(cheng)(cheng)果皮。