農作物種子的分類
農(nong)作物種(zhong)(zhong)(zhong)(zhong)子(zi)(zi)可(ke)分(fen)為有胚(pei)(pei)(pei)乳(ru)(ru)種(zhong)(zhong)(zhong)(zhong)子(zi)(zi)和無胚(pei)(pei)(pei)乳(ru)(ru)種(zhong)(zhong)(zhong)(zhong)子(zi)(zi),有胚(pei)(pei)(pei)乳(ru)(ru)種(zhong)(zhong)(zhong)(zhong)子(zi)(zi)由種(zhong)(zhong)(zhong)(zhong)皮、胚(pei)(pei)(pei)和胚(pei)(pei)(pei)乳(ru)(ru)組成,包(bao)括(kuo)蓖麻、煙草(cao)、西紅柿、柿、小麥(mai)、水稻、玉米、高粱和洋蔥等(deng)植(zhi)物的種(zhong)(zhong)(zhong)(zhong)子(zi)(zi);無胚(pei)(pei)(pei)乳(ru)(ru)種(zhong)(zhong)(zhong)(zhong)子(zi)(zi)包(bao)括(kuo)大(da)豆、落花生、棉、油(you)菜、瓜類、慈姑(gu)、澤瀉等(deng)的種(zhong)(zhong)(zhong)(zhong)子(zi)(zi)。
農作物種子檢驗規程
農(nong)作物種(zhong)(zhong)子(zi)檢(jian)(jian)驗規程由(you)扦樣(yang)、檢(jian)(jian)測(ce)(ce)和結(jie)果(guo)報(bao)告三(san)個(ge)方(fang)面的內容組成。扦樣(yang)是從大量的種(zhong)(zhong)子(zi)中,隨(sui)機取得(de)一(yi)個(ge)重(zhong)量適當,有代表性(xing)(xing)的供(gong)檢(jian)(jian)樣(yang)品,檢(jian)(jian)測(ce)(ce)部分包括種(zhong)(zhong)子(zi)的外(wai)在(zai)品質(凈度、發(fa)芽率、水分含量、生(sheng)活力、重(zhong)量和健康狀況)和內在(zai)品質(真實性(xing)(xing)和品種(zhong)(zhong)純度)的檢(jian)(jian)測(ce)(ce)。結(jie)果(guo)報(bao)告是對(dui)種(zhong)(zhong)子(zi)的質量檢(jian)(jian)驗報(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,以發芽(ya)率高(gao)、顆粒(li)飽滿(man)的種子(zi)為(wei)宜,注意不要(yao)買到(dao)假種子(zi)。
種子的傳播方式有幾種
植(zhi)(zhi)物種(zhong)子(zi)的(de)傳播(bo)方式有:①風力傳播(bo):依(yi)(yi)靠(kao)風來傳播(bo)種(zhong)子(zi);②水(shui)(shui)力傳播(bo):依(yi)(yi)靠(kao)水(shui)(shui)流傳播(bo)種(zhong)子(zi);③動物傳播(bo):依(yi)(yi)靠(kao)動物傳播(bo)種(zhong)子(zi);④自體傳播(bo):依(yi)(yi)靠(kao)植(zhi)(zhi)物自身(shen)傳播(bo)種(zhong)子(zi)。
種子是由什么發育而來的
胚珠發(fa)育成(cheng)(cheng)種子,受(shou)精卵發(fa)育成(cheng)(cheng)胚,子房發(fa)育成(cheng)(cheng)果實(shi),珠被發(fa)育成(cheng)(cheng)種皮,子房壁發(fa)育成(cheng)(cheng)果皮。