農作物種子的分類
農(nong)作(zuo)物(wu)種(zhong)(zhong)子(zi)(zi)可(ke)分為(wei)有(you)胚乳種(zhong)(zhong)子(zi)(zi)和無胚乳種(zhong)(zhong)子(zi)(zi),有(you)胚乳種(zhong)(zhong)子(zi)(zi)由種(zhong)(zhong)皮、胚和胚乳組(zu)成,包(bao)括蓖麻、煙草、西紅柿(shi)、柿(shi)、小麥、水稻、玉米、高粱(liang)和洋蔥(cong)等植物(wu)的種(zhong)(zhong)子(zi)(zi);無胚乳種(zhong)(zhong)子(zi)(zi)包(bao)括大豆(dou)、落花生、棉、油菜、瓜類、慈(ci)姑、澤(ze)瀉(xie)等的種(zhong)(zhong)子(zi)(zi)。
農作物種子檢驗規程
農作物種(zhong)(zhong)子(zi)(zi)檢(jian)(jian)驗(yan)(yan)規程由扦樣、檢(jian)(jian)測和(he)(he)結果(guo)報(bao)告(gao)三(san)個方(fang)面的(de)(de)內(nei)(nei)容組(zu)成(cheng)。扦樣是從(cong)大(da)量(liang)(liang)的(de)(de)種(zhong)(zhong)子(zi)(zi)中,隨機取得一(yi)個重量(liang)(liang)適(shi)當,有(you)代(dai)表(biao)性的(de)(de)供(gong)檢(jian)(jian)樣品,檢(jian)(jian)測部分(fen)包(bao)括種(zhong)(zhong)子(zi)(zi)的(de)(de)外在品質(zhi)(zhi)(凈度、發芽率、水分(fen)含(han)量(liang)(liang)、生(sheng)活力、重量(liang)(liang)和(he)(he)健康狀(zhuang)況)和(he)(he)內(nei)(nei)在品質(zhi)(zhi)(真實性和(he)(he)品種(zhong)(zhong)純度)的(de)(de)檢(jian)(jian)測。結果(guo)報(bao)告(gao)是對種(zhong)(zhong)子(zi)(zi)的(de)(de)質(zhi)(zhi)量(liang)(liang)檢(jian)(jian)驗(yan)(yan)報(bao)告(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(lv)高、顆粒飽(bao)滿的種子為宜(yi),注意不要買到(dao)假種子。
種子的傳播方式有幾種
植物(wu)種(zhong)子的傳(chuan)(chuan)播(bo)(bo)方(fang)式有:①風力傳(chuan)(chuan)播(bo)(bo):依靠(kao)風來(lai)傳(chuan)(chuan)播(bo)(bo)種(zhong)子;②水力傳(chuan)(chuan)播(bo)(bo):依靠(kao)水流(liu)傳(chuan)(chuan)播(bo)(bo)種(zhong)子;③動(dong)物(wu)傳(chuan)(chuan)播(bo)(bo):依靠(kao)動(dong)物(wu)傳(chuan)(chuan)播(bo)(bo)種(zhong)子;④自(zi)體(ti)傳(chuan)(chuan)播(bo)(bo):依靠(kao)植物(wu)自(zi)身傳(chuan)(chuan)播(bo)(bo)種(zhong)子。
種子是由什么發育而來的
胚珠發育(yu)成(cheng)(cheng)種子,受精卵發育(yu)成(cheng)(cheng)胚,子房(fang)發育(yu)成(cheng)(cheng)果(guo)實,珠被發育(yu)成(cheng)(cheng)種皮(pi),子房(fang)壁發育(yu)成(cheng)(cheng)果(guo)皮(pi)。