農作物種子的分類
農作物(wu)種(zhong)子(zi)(zi)(zi)(zi)(zi)可分為有胚(pei)乳種(zhong)子(zi)(zi)(zi)(zi)(zi)和無胚(pei)乳種(zhong)子(zi)(zi)(zi)(zi)(zi),有胚(pei)乳種(zhong)子(zi)(zi)(zi)(zi)(zi)由種(zhong)皮、胚(pei)和胚(pei)乳組成,包(bao)括蓖(bi)麻(ma)、煙草、西紅柿、柿、小麥、水稻、玉(yu)米、高粱(liang)和洋蔥等植物(wu)的(de)(de)種(zhong)子(zi)(zi)(zi)(zi)(zi);無胚(pei)乳種(zhong)子(zi)(zi)(zi)(zi)(zi)包(bao)括大豆、落花生、棉、油菜、瓜類、慈(ci)姑(gu)、澤瀉等的(de)(de)種(zhong)子(zi)(zi)(zi)(zi)(zi)。
農作物種子檢驗規程
農(nong)作物種(zhong)(zhong)子檢(jian)(jian)(jian)驗(yan)規程由(you)扦(qian)樣、檢(jian)(jian)(jian)測和(he)結果報告三個方面的(de)內容(rong)組成(cheng)。扦(qian)樣是(shi)從大量的(de)種(zhong)(zhong)子中,隨機取得一個重量適當,有代表性(xing)的(de)供檢(jian)(jian)(jian)樣品(pin)(pin),檢(jian)(jian)(jian)測部分(fen)(fen)包括種(zhong)(zhong)子的(de)外(wai)在品(pin)(pin)質(zhi)(凈度、發芽率(lv)、水分(fen)(fen)含(han)量、生活力、重量和(he)健康狀(zhuang)況)和(he)內在品(pin)(pin)質(zhi)(真實性(xing)和(he)品(pin)(pin)種(zhong)(zhong)純度)的(de)檢(jian)(jian)(jian)測。結果報告是(shi)對種(zhong)(zhong)子的(de)質(zhi)量檢(jian)(jian)(jian)驗(yan)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(fa)芽(ya)率高、顆粒飽滿的種(zhong)(zhong)子為宜(yi),注(zhu)意不(bu)要(yao)買(mai)到(dao)假種(zhong)(zhong)子。
種子的傳播方式有幾種
植物種子的傳(chuan)(chuan)(chuan)(chuan)播(bo)方(fang)式有:①風力傳(chuan)(chuan)(chuan)(chuan)播(bo):依靠風來(lai)傳(chuan)(chuan)(chuan)(chuan)播(bo)種子;②水力傳(chuan)(chuan)(chuan)(chuan)播(bo):依靠水流(liu)傳(chuan)(chuan)(chuan)(chuan)播(bo)種子;③動物傳(chuan)(chuan)(chuan)(chuan)播(bo):依靠動物傳(chuan)(chuan)(chuan)(chuan)播(bo)種子;④自體(ti)傳(chuan)(chuan)(chuan)(chuan)播(bo):依靠植物自身傳(chuan)(chuan)(chuan)(chuan)播(bo)種子。
種子是由什么發育而來的
胚珠發(fa)(fa)育成(cheng)(cheng)種子,受精卵(luan)發(fa)(fa)育成(cheng)(cheng)胚,子房發(fa)(fa)育成(cheng)(cheng)果實(shi),珠被發(fa)(fa)育成(cheng)(cheng)種皮,子房壁發(fa)(fa)育成(cheng)(cheng)果皮。