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農作物種子的分類

農作物種(zhong)(zhong)(zhong)(zhong)子可(ke)分為有(you)(you)胚(pei)(pei)乳(ru)種(zhong)(zhong)(zhong)(zhong)子和(he)無胚(pei)(pei)乳(ru)種(zhong)(zhong)(zhong)(zhong)子，有(you)(you)胚(pei)(pei)乳(ru)種(zhong)(zhong)(zhong)(zhong)子由種(zhong)(zhong)(zhong)(zhong)皮、胚(pei)(pei)和(he)胚(pei)(pei)乳(ru)組(zu)成，包括(kuo)蓖麻、煙草、西紅柿、柿、小麥、水稻、玉(yu)米、高粱和(he)洋(yang)蔥等(deng)植物的種(zhong)(zhong)(zhong)(zhong)子；無胚(pei)(pei)乳(ru)種(zhong)(zhong)(zhong)(zhong)子包括(kuo)大豆(dou)、落花生、棉、油菜(cai)、瓜類、慈姑、澤(ze)瀉(xie)等(deng)的種(zhong)(zhong)(zhong)(zhong)子。

農作物種子檢驗規程

農作物種(zhong)子(zi)檢(jian)驗(yan)規(gui)程由扦樣(yang)、檢(jian)測(ce)和結果報(bao)告三個方(fang)面的(de)內容組(zu)成。扦樣(yang)是從大(da)量(liang)的(de)種(zhong)子(zi)中(zhong)，隨機(ji)取得一個重量(liang)適當，有代表性(xing)的(de)供檢(jian)樣(yang)品(pin)，檢(jian)測(ce)部分(fen)(fen)包括種(zhong)子(zi)的(de)外在品(pin)質(zhi)（凈度、發芽(ya)率、水分(fen)(fen)含量(liang)、生活力、重量(liang)和健康狀(zhuang)況）和內在品(pin)質(zhi)（真(zhen)實(shi)性(xing)和品(pin)種(zhong)純度）的(de)檢(jian)測(ce)。結果報(bao)告是對種(zhong)子(zi)的(de)質(zhi)量(liang)檢(jian)驗(yan)報(bao)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)芽率高(gao)、顆粒(li)飽滿的種(zhong)子為宜，注意不(bu)要(yao)買(mai)到(dao)假種(zhong)子。

種子的傳播方式有幾種

植(zhi)物(wu)種(zhong)(zhong)子(zi)的傳(chuan)(chuan)(chuan)(chuan)播(bo)方式有：①風力傳(chuan)(chuan)(chuan)(chuan)播(bo)：依(yi)靠(kao)風來(lai)傳(chuan)(chuan)(chuan)(chuan)播(bo)種(zhong)(zhong)子(zi)；②水力傳(chuan)(chuan)(chuan)(chuan)播(bo)：依(yi)靠(kao)水流傳(chuan)(chuan)(chuan)(chuan)播(bo)種(zhong)(zhong)子(zi)；③動物(wu)傳(chuan)(chuan)(chuan)(chuan)播(bo)：依(yi)靠(kao)動物(wu)傳(chuan)(chuan)(chuan)(chuan)播(bo)種(zhong)(zhong)子(zi)；④自體傳(chuan)(chuan)(chuan)(chuan)播(bo)：依(yi)靠(kao)植(zhi)物(wu)自身(shen)傳(chuan)(chuan)(chuan)(chuan)播(bo)種(zhong)(zhong)子(zi)。

種子是由什么發育而來的

胚(pei)珠發育(yu)(yu)成(cheng)(cheng)種(zhong)子(zi)，受精(jing)卵(luan)發育(yu)(yu)成(cheng)(cheng)胚(pei)，子(zi)房發育(yu)(yu)成(cheng)(cheng)果實，珠被(bei)發育(yu)(yu)成(cheng)(cheng)種(zhong)皮(pi)，子(zi)房壁發育(yu)(yu)成(cheng)(cheng)果皮(pi)。