紫云縣(xian)境(jing)(jing)內(nei)(nei)有優質(zhi)(zhi)紅(hong)(hong)薯生(sheng)長的(de)(de)自然(ran)環境(jing)(jing)。縣(xian)內(nei)(nei)河流密布,土(tu)(tu)層(ceng)深厚,土(tu)(tu)壤(rang)類型(xing)多砂質(zhi)(zhi)型(xing)的(de)(de)紅(hong)(hong)壤(rang)土(tu)(tu)與黃壤(rang)土(tu)(tu),富(fu)含磷、鉀(jia)、硅、鐵等微量(liang)(liang)元素(su)(su)。土(tu)(tu)壤(rang)PH值多在5.0-7.0之間(jian),這正是優質(zhi)(zhi)紅(hong)(hong)芯薯生(sheng)長需要(yao)的(de)(de)土(tu)(tu)壤(rang)環境(jing)(jing)。全境(jing)(jing)廣泛分(fen)布頁(ye)(ye)巖(yan),這種頁(ye)(ye)巖(yan)易(yi)于風化(hua),尤其是泥質(zhi)(zhi)頁(ye)(ye)巖(yan),群(qun)眾稱(cheng)為“風化(hua)巖(yan)”,物(wu)理分(fen)化(hua)迅速,風化(hua)物(wu)富(fu)含磷、鉀(jia)、硅、鐵。特別是鉀(jia),其他微量(liang)(liang)元素(su)(su)含量(liang)(liang)也高,因而礦物(wu)質(zhi)(zhi)養(yang)(yang)分(fen)較(jiao)(jiao)為齊(qi)全。自然(ran)肥力較(jiao)(jiao)高,土(tu)(tu)層(ceng)中(zhong)多含半風化(hua)母(mu)巖(yan)碎屑,土(tu)(tu)質(zhi)(zhi)泡松,通(tong)氣(qi)透水,供肥性(xing)(xing)能良好,微酸至(zhi)酸性(xing)(xing)反應。這種土(tu)(tu)壤(rang)適宜紅(hong)(hong)薯的(de)(de)生(sheng)長,故歷來(lai)有“紅(hong)(hong)薯半年糧(liang)"的(de)(de)俗稱(cheng)。砂巖(yan)及(ji)母(mu)質(zhi)(zhi)風化(hua)物(wu)中(zhong)質(zhi)(zhi)地較(jiao)(jiao)細,養(yang)(yang)分(fen)含量(liang)(liang)較(jiao)(jiao)高的(de)(de)顆粒多被搬(ban)運堆積在坡臺(tai)地,形(xing)成的(de)(de)耕地土(tu)(tu)壤(rang)以黃壤(rang)黃棕(zong)壤(rang)為主(zhu)。這類土(tu)(tu)壤(rang)質(zhi)(zhi)地適中(zhong),疏松通(tong)氣(qi)。水、肥、氣(qi)、熱協調。有機質(zhi)(zhi)及(ji)磷、鉀(jia)含量(liang)(liang)豐富(fu)。養(yang)(yang)分(fen)轉化(hua)迅速,土(tu)(tu)壤(rang)供肥性(xing)(xing)好。
紫云(yun)縣(xian)(xian)(xian)境內(nei)(nei)(nei)境內(nei)(nei)(nei)著名的(de)(de)“北盤江低(di)熱(re)河(he)谷氣(qi)候(hou)”提供紅(hong)薯(shu)(shu)生(sheng)(sheng)長(chang)(chang)(chang)和紅(hong)薯(shu)(shu)粉絲(si)加工的(de)(de)氣(qi)候(hou)環境,降水(shui)充沛(pei),有利(li)于(yu)(yu)(yu)紅(hong)薯(shu)(shu)快(kuai)速生(sheng)(sheng)長(chang)(chang)(chang),植物生(sheng)(sheng)長(chang)(chang)(chang)積溫(wen)(wen)(wen)高(gao),方便于(yu)(yu)(yu)優質(zhi)紅(hong)芯(xin)薯(shu)(shu)生(sheng)(sheng)長(chang)(chang)(chang)。紫云(yun)縣(xian)(xian)(xian)地處黔中腹地丘陵過渡的(de)(de)斜(xie)坡地帶,縣(xian)(xian)(xian)境內(nei)(nei)(nei)多(duo)河(he)谷平(ping)壩(ba)(ba)和山(shan)問(wen)谷地,常成(cheng)為冷暖氣(qi)團回(hui)旋儲積之(zhi)地,故形成(cheng)特有的(de)(de)貴州高(gao)原“壩(ba)(ba)子氣(qi)候(hou)”,該(gai)氣(qi)候(hou)有以下特點:首先是(shi)(shi)冬夏季(ji)節長(chang)(chang)(chang),溫(wen)(wen)(wen)差大,冬季(ji)溫(wen)(wen)(wen)涼(liang),夏季(ji)炎熱(re)。冬季(ji)從(cong)小雪至(zhi)驚(jing)蟄,約l00天(tian)(tian),最冷月(yue)(1月(yue))平(ping)均(jun)氣(qi)溫(wen)(wen)(wen)3—5℃。夏季(ji)從(cong)立夏至(zhi)秋分,約145天(tian)(tian),是(shi)(shi)四季(ji)中最長(chang)(chang)(chang)的(de)(de)一(yi)季(ji),最熱(re)月(yue)(7月(yue))平(ping)均(jun)氣(qi)溫(wen)(wen)(wen)27—28℃。其次是(shi)(shi)云(yun)霧多(duo),日(ri)照少,日(ri)照率(lv)低(di),但較集(ji)中。最后是(shi)(shi)雨日(ri)多(duo),雨量大,降水(shui)集(ji)中,濕(shi)熱(re)同季(ji)。連續降雨日(ri)數一(yi)般(ban)3—5天(tian)(tian)。春夏之(zhi)交可達26天(tian)(tian)之(zhi)久,年均(jun)降水(shui)量一(yi)般(ban)1300毫(hao)米(mi)左(zuo)右。結合紅(hong)薯(shu)(shu)生(sheng)(sheng)長(chang)(chang)(chang)的(de)(de)溫(wen)(wen)(wen)度(du)(du)(du)(du)條(tiao)件(jian)分析:塊(kuai)(kuai)根(gen)(gen)(gen)萌(meng)芽(ya)與(yu)溫(wen)(wen)(wen)度(du)(du)(du)(du)的(de)(de)關系,萌(meng)芽(ya)最低(di)溫(wen)(wen)(wen)度(du)(du)(du)(du)16~18℃,適(shi)(shi)宜溫(wen)(wen)(wen)度(du)(du)(du)(du)28~32℃,超(chao)過35℃萌(meng)芽(ya)受(shou)抑制。蔓(man)葉生(sheng)(sheng)長(chang)(chang)(chang)與(yu)溫(wen)(wen)(wen)度(du)(du)(du)(du)的(de)(de)關系,最適(shi)(shi)溫(wen)(wen)(wen)度(du)(du)(du)(du)21~26℃,低(di)于(yu)(yu)(yu)15℃生(sheng)(sheng)長(chang)(chang)(chang)停止(zhi),高(gao)于(yu)(yu)(yu)38℃生(sheng)(sheng)長(chang)(chang)(chang)受(shou)抑制。根(gen)(gen)(gen)生(sheng)(sheng)長(chang)(chang)(chang)與(yu)溫(wen)(wen)(wen)度(du)(du)(du)(du)的(de)(de)關系,不(bu)定根(gen)(gen)(gen)的(de)(de)發(fa)生(sheng)(sheng)要求地溫(wen)(wen)(wen)15℃以上,在15~30℃的(de)(de)范圍(wei)內(nei)(nei)(nei),溫(wen)(wen)(wen)度(du)(du)(du)(du)越高(gao)發(fa)根(gen)(gen)(gen)越快(kuai)。塊(kuai)(kuai)根(gen)(gen)(gen)形成(cheng)的(de)(de)適(shi)(shi)宜地溫(wen)(wen)(wen)21~29℃,低(di)于(yu)(yu)(yu)20℃或高(gao)于(yu)(yu)(yu)32℃均(jun)不(bu)利(li)塊(kuai)(kuai)根(gen)(gen)(gen)形成(cheng);塊(kuai)(kuai)根(gen)(gen)(gen)膨(peng)大的(de)(de)適(shi)(shi)宜溫(wen)(wen)(wen)度(du)(du)(du)(du)為22~23℃,膨(peng)大的(de)(de)最低(di)溫(wen)(wen)(wen)度(du)(du)(du)(du)為16~18℃。良(liang)好的(de)(de)氣(qi)候(hou)條(tiao)件(jian)形成(cheng)了紅(hong)芯(xin)紅(hong)薯(shu)(shu)的(de)(de)優良(liang)品質(zhi)。
紫云(yun)縣所轄五峰街(jie)道、松山街(jie)道、貓營(ying)(ying)鎮、板當(dang)鎮、壩羊鎮、格(ge)凸河(he)鎮、四大寨鄉、宗地鎮、猴場鎮、大營(ying)(ying)鎮、白石巖鄉共2個(ge)街(jie)道、7個(ge)鎮、2個(ge)鄉、147個(ge)行政村。保護(hu)(hu)范圍東(dong)至(zhi)(zhi)板當(dang)鎮尅混村,南至(zhi)(zhi)大營(ying)(ying)鎮打哇坪(ping)村,西至(zhi)(zhi)白石巖鄉新馳村,北至(zhi)(zhi)貓營(ying)(ying)鎮黃土村。地理坐標:東(dong)經105°55′~106°29′,北緯(wei)25°21′~26°03′。保護(hu)(hu)規模:面(mian)積2000公頃,產(chan)量2.4萬(wan)噸,產(chan)值14400萬(wan)元(yuan)。
外在(zai)感官特征:呈(cheng)長紡(fang)錘(chui)形,單個重50~200g,表皮(pi)光(guang)滑、呈(cheng)淡黃色(se),肉質淡粉色(se),色(se)澤(ze)鮮亮;鮮食(shi)質脆味(wei)甜(tian),蒸熟后通體晶(jing)瑩(ying),薯肉淡黃色(se),細膩綿軟,甘甜(tian)具板栗香(xiang)味(wei)。
內在品質:淀粉≥19.0%、粗(cu)纖維≤1.5%、還原(yuan)糖(以葡萄糖計)≥1.0%。
安全(quan)要求:紫云紅芯(xin)紅薯質量(liang)安全(quan)須(xu)符(fu)合(he)《中華人民共和國農產品質量(liang)安全(quan)法》等相關法律法規要求,以(yi)及符(fu)合(he)國家(jia)有關強制性(xing)技(ji)術規范(fan)要求。