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Effect of Nitrate and Ammonium Nitrogen Sources on the Growth, Photorespiration, Dark Respiration and Activities of Related Enzymes in Wheat (Triticum aestivum L.) Taiwan Agricultural Research Institute
D.J. Liu; 劉大江.
[[abstract]]Wheat seedlings were grown hydroponically with 100 ppm of either nitrate or ammonium as the N source. Plant growth, CO2 compensation concentration, dark respiration rate and activities of several related enzymes were measured and analyzed. The purpose was to study the influence of N forms on the carbon metabolism in plants. Wheat seedlings grew better in solution supplied with nitrate. The detrimental effect of ammonium on the growth could be reverted partially by increasing the pH of culture medium to 7.0. CO2 compensation concentration was 15 ppm lower for nitrate-grown plant than for ammoniu-grown plants. However, the difference was also oriented partly by the pH of culture solution. pH value of tissue extracts was not affected by N...
Palavras-chave: [[classification]]6.
Ano: 1989
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Effects of N Fertilization on the Growth and Yield of Two Maize Hybrids Taiwan Agricultural Research Institute
C.S. Wang; S.H. Tsao; D.J. Liu; 王強生; 曹紹徽; 劉大江.
[[abstract]]A single-cross maize hybrid, Tainung No. 351, and a double-cross hybrid, Tainan No. 11, were grown in the field at a density of 58,800 plants/ha in the fall of 1983. N rates of 75, 150, 225 and 300 kg/ha were supplied in the form of ammonium sulfate. Samplings were made at a two-week interval starting from mid-silking to maturity. Leaf area and N and total nonstructural carbohydrate (TNC) concentrations were determined in plant fractions. The purposes of this study were to compare the physiological differences between the two hybrids and to clarify the physiological basis of the high yield potential of Tainung No. 351. Results showed that increased N fertilization delayed the dates of heading and silking. Grain yield of Tainung No. 351...
Palavras-chave: [[classification]]6.
Ano: 1986
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Effects of Nitrate and Ammonium Nitrogen Sources on the Seedling Growth and Root Phosphoenolpyruvate Carboxylase Activity of Different Crop Species Taiwan Agricultural Research Institute
D.J. Liu; C.S. Wang; M.L. Wei; 劉大江; 王強生; 魏夢麗.
[[abstract]]Seven crop species, including maize, sorghum, rice, wheat, barley, peanut and soybean, were grown hydroponically with either nitrate or ammonium N at a concentration of 150 ppm. Rates of seedling growth were determined to study the effect of N sources on the performances of carbon metabolism. As ammonium N could enhance the activity of PEP carboxylase in the roots of many crops, attempts had been made to clarify the characteristics of this enzyme in order to provide basis for further studies. Experimental results showed that crops grew better in nitrate N than in ammonium N medium. However, shoots of rice and wheat gained more fresh weight when treated with ammonium N which was different from the results on maize, sorghum and peanut, indicating...
Palavras-chave: [[classification]]6.
Ano: 1987
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Nitrogen distribution and N2-fixing activity of developing soybean (Glycine max (L.) Merrill) Plants Taiwan Agricultural Research Institute
D.D. Huang; M.C.Shen; C.S. Chen; D.J. Liu; 黃定鼎; 沈美珍; 陳建山; 劉大江.
[[abstract]]Field experiments were conducted to investigate the distribution of N and the specific activity of N2-fixation of soybeans at successive stages of plant development. Nitrogen concentration in leaf blades was consistently higher than those in leaf petioles, stems and roots. Concentration in each plant part, except the seeds, usually decreased as the season progressed. However, N in leaf blades showed a sudden decline at V7 stage and an increase later at R2 stage. Pattern of changes in N in plant parts from different varieties usually was similar. During the pod-filling period (R4-R6), N was redistributed to seeds from vegetative tissues. Shih-Shih and Kaohsiung No. 3 maintained a higher level of N in leaf blades in this period as compared...
Palavras-chave: [[classification]]6.
Ano: 1980
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不同粒重水稻品種葉片形態與氮素代謝性狀差異比較 Taiwan Agricultural Research Institute
魏夢麗; 張富洲; 劉大江; M.L. Wei; F.C. Chang; D.J. Liu.
[[abstract]]本試驗以大粒型品種Pegonil、中粒型品種臺農67號與兩個粒重較高之臺農67號近同源系為主要材料,比較其間葉片形態性狀、氮素代謝酵素活性及維管束性狀的差異,藉以探討影響具不同粒重水稻種源光合及氮素代謝能力之機制。與大粒型品種比較,中粒型品種葉長自上位葉至下位葉顯著增加,葉寬減幅極小,田間透光度較佳,且下位葉比葉重較高,有利於光合作用表現。大粒品種葉片氮素濃度雖然較高,在穀粒充實期間葉綠素及可溶性蛋白質濃度降低的幅度與速率却高於中粒品種,亦即受老化影響,生理活性快速衰退。自抽穗期以後,glutamine synthetase活性逐漸降低,近成熟期時之活性以臺農67號為高,而Pegonil之proteinase活性則超過臺農67號三倍以上,顯示中粒型品種具有較高的氮素同化能力;glutamate dehydrogenase活性在穀粒充實期間的變化不大,推測對氮素代謝的影響較小。兩個回交系統的含氮化合物濃度及氮素代謝作用表現不受粒重影響,較趨近中粒親本臺農67號。造成品種間氮素代謝差異的主因,可能為穀粒對氮素需求的積儲強度。臺農67號葉脈數與葉脈頻度較Pegonil為高,篩管面積則較小,尚難據以判定輸導能力之強弱,但臺農67號篩管面積與維管束面積比值顯著較高,而兩個回交系統之維管束面積亦顯示雜種優勢,為具有利用價值之生理性狀,有必要對此變異性再加研究。 A medium-grain variety, Tainung 67 , a large-grain variety, Pegonil, and two each of their BC5 and BC6 offsprings with caryopsis weight about 28.5mg were used to study...
Palavras-chave: [[classification]]6.
Ano: 1989
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二期作水稻光合成物質的生產、分配及與產量間的關係 Taiwan Agricultural Research Institute
楊藹華; 梁文實; 魏夢麗; 劉大江; A.H. Yang; W.S. Liang; M.L. Wei; D.J. Liu.
[[abstract]]於70 年二期作在羅東、臺中與屏東共栽培4 個水稻品種,自抽穗期至成熟期間,每十天取樣一次,分析植株不同器官內乾物質、全氮及非構造性碳水化合物(TNC )含量變化。以瞭解二期作水稻穀粒充實期間光合成物質的生產能力及分配,對其增產之可能性加以評估,並於不同地區間進行比較。 水稻穀粒充實期間,葉片內的氮濃度明顯下降,莖稈的降低幅度較小,穗部則無顯著變化。葉片TNC 濃度的變異頗不規則,莖稈部位極顯著的下降,表示有多量碳水化合物向穗部轉移。三個地區的稉稻全株乾物質生產量均在6-8g 之間,臺中秈10號則高達12g ,但與產量的關係並非完全一致,可能與乾物質的分配效率有關。非構造性碳水化合物的淨生產則與產量有密切之關係,臺中地區的兩個秈稻品種,每株可增加14-18g 的TNC ,產量為29-33g ,其他兩個稉稻品種則分別為6-11g 之TNC 與16-20g 的穀產量。 羅東地區臺南5 號產量最低的原因為一穗穎花數太少,臺中地區秈稻高產則歸因於穗數或一穗穎花數較多。收穫指數介於0.52-0.67 之問,且產量越高,收穫指數亦高;氮收穫指數(harvest N index )也有相同的表現,即產量高時,穗部含氮量佔全株含氮量的比值增高,但二者間之因果關係則未能明瞭。非構造性碳水化合物收穫指數(harvest TNC index )高達0.91 - 0.97 ,以羅東臺南5 號最低,表示部分葉片所生產的TNC 儲存於莖稈,未能充份轉運至穗部;而較高產水稻品種殘留營養器官內之TNC 僅為3-4 %,可能無法充份供應穗部需要,亦即光合成能力成為產量限制因子。 就乾物質之生產、分佈及TNC...
Palavras-chave: [[classification]]6.
Ano: 1983
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利用錘刀式割草機改進大面積水稻再生栽培技術研究 Taiwan Agricultural Research Institute
賴吉雄; 楊清祥; 陳志昇; 劉大江; C.H. Lai; C.H. Yang; C.S. Chen; D.J. Liu.
[[abstract]]採用臺農67號與臺農70號水稻品種為材料,於一期作收穫後續行宿根栽培,探討大型錘刀式割草機應用於再生稻栽培的可行性,以及不可割蘗與稻草覆蓋等處理方式對再生稻生長與產量的影響,同時進行大面積操作試驗與經濟效益分析,以期建立水稻宿根栽培技術與完整之機械作業體系。試驗結果摘要如下: l﹒初步測試以曳引機附掛錘刀式割草機取代背負式割草機從事再生芽割樁處理,結果每公頃所需時間平均為1.38小時,較背負式割草機所需之17.20小時快達l2.43倍。 2﹒上項曳引機附掛錘刀式割草機從事再生芽割樁處理,理論工作量為每小時1.14公頃,但實際工作量平均為每小時0.72公頃,機器實際工作效率平均僅63%,其原因除已知受田面泥濘影響外,其他左右因素有待檢討。 3﹒在方法比較試驗方面,初步結果發現水稻臺農57號產量以稻草田面敷蓋配合錘刀式割草機割樁處理為最優,臺農70號以田面不敷蓋配合背負式割草機割樁處理之產量最高,品種間表現迴異,且處理間比較,差異多未達顯著水準,推測與一期作收穫期前後及稻樁處理前後連續陰雨,試驗田區較大而田面條件不一有關,如何克服因天候導致之困難,為一待探討的問題。 4﹒大面積操作試區之再生稻平均公頃產量為臺農67號3,887公斤,較移植對照區減產13.9%,臺農70號為4,135公斤,較移植區減產0.5%。栽培方法試驗區產量為移植對照區之69.2-84.8%(臺農67號)及87.2-93.1%(臺農70號),因小區內機械迴轉頻繁,使稻樁損傷嚴重,影響試驗成績;此可由大面積操作試驗產量均較方法比較試驗田相同處理者為高得到印證。...
Palavras-chave: [[classification]]16.
Ano: 1988
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去葉處理與栽植密度對大粒型水稻品種產量表現的影響 Taiwan Agricultural Research Institute
魏夢麗; 劉大江; M.L. Wei; D.J. Liu.
[[abstract]]為探討藉密植栽培增加大粒型水稻單位面積穗數以提高產量的可能性,及於抽穗期與抽穗後一週去除50 %葉片,以明瞭穀粒充實期間光合成物質的供需平衡關係,本試驗採用大粒型水稻品種Pegonil 與中粒型品種臺農67 號為材料,於抽穗後定期測定乾物質之累積與分佈,分析植株各器官全氮與非構造性碳水化合物(TNC)濃度的變化,並解析與產量表現間的關係。在第二期作的栽培環境下,臺農67 號較Pegonil 品種高產40%,穎花數與穗數為導致差異的主要產量構成因素。於抽穗期去除50%葉片,對成熟期Pegonil 穗重並無影響,但使臺農67 號穗重減輕32%,抽穗後一週去葉使兩品種穗重分別降低14%與32%;去除部份葉片使穗部氮濃度降低,但對葉片與莖稈氮濃度的影響甚小,亦即氮素再轉移至穗部之量甚微,此一現象與同一時期莖稈TNC 濃度大幅下降,顯示可能因光合成物質供應不足而降低根部活性,致使氮素供應不敷穀粒充實之需。密植栽培(行株距30 × 7.5 cm)較一般栽培(行株距30 × 15cm)可提高Pegonil 產量42%,唯仍較臺農67 號低產20%;密植使單株穗數減少,但大幅增加單位面積穗數,且不影響其他產量構成要素的表現,顯示改良栽培方法以提高大粒型水稻產量的可行性。高族群密度亦使穀粒氮濃度下降,在植株氮素供需與光合成物質的影響方面,可能與去葉處理具有相似的作用機制。本試驗中大粒型品種在抽穗後3 週內,單穗乾物質、全氮與TNC 的累積速率均顯著超過臺農67 號,為可資利用之優良生理特性,但穀粒充實期較短,穗內穎花累積TNC 之均一性差距頗大,易導致產量效率(yield efficiency)之降低。 Studies were conducted to examine the possibility...
Palavras-chave: [[classification]]6.
Ano: 1986
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大豆不同節位之供源與積儲關係研究 Taiwan Agricultural Research Institute
曾紹徽; 王強生; 劉大江; S.H. Tsao; C.S. Wang; D.J. Liu.
[[abstract]]本試驗以大豆十石品種為材料,於生殖生長期間分析自基部計算第6 、8 與12 (最頂端)節位葉片之葉面積與葉綠素含量,葉片及莢果乾物重、氮素與非構造性碳水化合物(TNC )濃度,以比較不同節位供源一積儲單位間之生理差異,以及對產量的影響。試驗結果顯示在種子形成(R5 )期以前,各性狀並未顯示出節位性差異,亦即各供源一積儲單位間的關係較為單純,在此一時期葉片具有較高的生理活性,比葉重與TNC 濃度增高,氮素濃度未明顯下降,而莢果壁具有暫時性的積儲功能。自種子開始形成以後,由於不同節位葉片之發生時序(sequential ontogeny )導致生理活性差異,增加了供源葉片與積儲種子間關係的複雜性;頂端節位葉片的比葉重持續上升,莢果壁含有較高的乾物重與氮量,但種子產量,充實速率及種子充實度均較低,與較低節位的表現相反,亦即上位葉片雖能維持較長的生理活性,但下位莢果對產量的重要性較高。試驗結果建議如能延緩大豆葉片生理活性之老化及提高高節位莢果種子之充實度,應可改善供源與積儲間之關係,並進而提高產量。 This paper investigated the relationship between source and sink organs at 3 different node positions of soybean plants during the reproductive growth period. Using Shih-Shih as experimental variety, samples were taken weekly from the 6th, 8th, and the upper-most nodes, starting from the flowering...
Palavras-chave: [[classification]]6.
Ano: 1985
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大豆種子與莢果壁非構造性碳水化合物與氮素含量之變化 Taiwan Agricultural Research Institute
王強生; 曹紹徽; 劉大江; C.S. Wang; S.H. Tsao; D.J. Liu.
[[abstract]]以大豆品種十石為材料,於1982及1983年夏作進行試驗,在生殖生長期間密集取樣,調查分析第 6-8 節位莢果壁與種子內乾物質、非構造性碳水化合物(TNC)及全氮(N)含量之變化,以明瞭大豆種子充實與TNC及N之利用情形。莢果壁內TNC濃度於R3-R4期最高,其後有下降趨向,但均維持於5-8%之間;N濃度則於 R4 期以後持續降低,顯示可充份轉移至種子。種子內TNC濃度於快速充實期間(R6)最高,而N素濃度之變化甚微,亦即種子乾物質與N素之累積有平行關係存在。莢果壁內TNC含量在R6期以前與種子TNC含量並行增加,在成熟期時僅小幅減少,對種子充實之重要性可能極為有限;莢果壁內所含N素在種子充實期問可大量轉移,亦即具有較高的利用效率,唯種子含N量由莢果壁轉移者,估計最高不超過9%。種子對莢果壁TNC與N素之利用程度有異,兩種營養要素亦可能經由不同途經轉移。 Soybeans (cultivar Shih-Shih) were grown in the summer crops of 1982 and 1983. Extensive samplings were made on the 6th to 8th nodes during pod-filling for the determination of dry weight and concentrations of TNC (total nonstructural carbohy-drates) and N in the pod wall and seeds. TNC concentrations in the pod wall peaked at R3-R4 stage and showed a very slight...
Palavras-chave: [[classification]]6.
Ano: 1987
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栽培密度對玉米乾物質累積之影響 Taiwan Agricultural Research Institute
王強生; 曾紹徽; 劉大江; C.S. Wang; S.H. Tsao; D.J. Liu.
[[abstract]]本試驗於74 年秋作進行,採用玉米臺農351 號品種為材料,以每公頃125,000 株(Dl)、62,500 株(D2 )與31,250 株(D3 )三種密度種植,並於吐絲期及吐絲後二週分別施以Dl → D2 、Dl → D3 與D2 → D3 等三種密度變化處理,目的在經由不同生育期改變族群密度,探討對玉米植株乾物質生產、分配及產量等性狀的影響。 族群密度遞減時(Dl : D2 : D3),單株乾物產量增加(226 : 267 : 312g),成熟期不充實穗長比率減少(21 : 16: 13%),全穗長增加(13.8 : 14.9 : 16.5cm),每穗粒數明顯增加(465 : 503 : 587 粒),單株子粒產量亦因而提高(97.9 : l17.0 : 130.4g),但公頃子粒產量因受株數影響而顯著降低(12.2 : 7.3 : 4.lt / ha),並與最大葉面積指數(7.46 : 3.89 : 2.07 )密切相關。成熟期脫粒率及子粒乾物質分配率亦隨密度降低而減小,顯示疏值玉米之產量受限於積儲容積,乾物質利用效率較差。 於吐絲期及其後二週降低族群密度,可顯著提高單株乾物質生產力,使一株產量及各構成要素表現優於原族群密度之結果(如Dl-D2 處理之單株子粒產量較Dl 或D2 處理之產量為高),且以吐絲期進行密度變化之效果最為明顯。族群密度經降低後,乾物質分配至葉片及莖桿之比率減少,而分配至苞葉、穗軸及子粒等生殖器官之比率升高,其中以子粒之增幅最大。吐絲期植株葉面積已達最大值之85-97%,但乾物重不及成熟期之40%,顯示葉片供源能力於吐絲後始充份表現;於吐絲期間降低族群密度,有提高葉片活性、子粒容積與充實速率的共同效應,為間拔處理效果顯著的重要原因。 Maize...
Palavras-chave: [[classification]]6.
Ano: 1987
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栽培密度對高粱產量性狀之影響 Taiwan Agricultural Research Institute
王強生; 林淑雰; 劉大江; C.S. Wang; S.F. Lin; D.J. Liu.
[[abstract]]試驗以高粱臺中五號為材料,1985年秋作與1986年春作以每公頃40萬、20萬與10萬株之密度栽培,198年春作以每公頃40萬、33萬、25萬與20萬株之密度試驗,收穫後續行宿根栽培,探討對產量性狀表現的影響。1985/86年試驗結果發現單株產量雖因疏植而提高,但公頃子粒產量依族羣密度增加而提高,秋作產量又高於春作;公頃株數為40萬株處理之產量在春作為9.7 t/ha,秋作為14.5 t/ha;春、秋作慣行栽培之20萬株處理產量分別為6.9與11.0 t/ha。密植增產的主因為單位面積粒數增多,千粒重之影響居次。1987年春作密植雖亦有提高產量的趨勢,但以配合重氮肥處理之效應較為顯著,且增產幅度小於1985/86年之結果;密值增產亦為單位面積穗數與粒數增加所致,千粒重的影響不大。宿根作高梁單位面積產量對栽培密度的反應較不明顯,但單株產量則極顯著隨疏植而增加。宿根作子粒產量極高,各處理之產量達14-17 t/ha之間,亦即適於密植栽培;但氮肥施用量對宿根高梁產量之影響較不明顯,有關肥力問題猶待確定。綜合而言,臺中五號高粱品種具有極高的生產潛力,再生能力強,耐密植而不倒伏,現行栽培密度應有再予提高的可能。 Sorghum hybrid Taichung No. 5 was grown in the fall crop of 1985 and spring crop of 1986 at three planting densities, i. e., 400,000, 200,000 and 100,000 plants/ha. In the spring crop of 1987, sorghum was cultivated at row-spacings of 25, 30, 40...
Palavras-chave: [[classification]]6.
Ano: 1989
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水稻臺農67號及其粒重型近同源系之光合物質與氮素供需關係比較 Taiwan Agricultural Research Institute
張富洲; 魏夢麗; 劉大江; F.C. Chang; M.L. Wei; D.J. Liu.
[[abstract]]本試驗採用中粒型水稻品種臺農67號(千粒重約25g)、大粒型品種Pegonil(千粒重40g以上)及四個以前者為輸迴親經回交五或六代並自交多次之臺農67號粒重型(千粒重約30─36g)近同源系為材料,在田間進行兩年四作試驗,比較抽穗至成熟期間之乾物質及氮素累積量,分析粒重效應對光合物質與氮素供需關係的影響。臺農67號的稻穀產量均高於Pegonil品種;經連續四作調查,回交後代的粒重穩定,部份之產量並與臺農67號相近,但未能超越。臺農67號抽穗後累積乾物量佔成熟期總乾物量之40%以上,在期作間頗為穩定;對Pegonil與回交品系而言,此一比值以第一期作較低,於期作內並與產量表現有正相關關係。抽穗後乾物生成量低於穀粒產量,亦即有顯著之再轉移現象。各品種及品系之收穫指數均在0.45以上,但基因型間之乾物分配效率仍有差異,以生產力較高之BC-6品系較低。大粒型品種Pegonil葉片、莖稈與穗部氮素濃度均顯著高於臺農67號,回交品系雖具粒重特性,但氮素濃度則與中粒型親本相同。穀粒充實期間水稻植株累積氮量佔總氮量之比例,平均以Pegonil最低,第二期作又顯著較第一期作為高;抽穗後累積氮量平均僅為穀粒氮含量之40%以下,亦即穀粒充實對營養器官氮素轉移具有極高的依賴性。本試驗結果顯示粒重型近同源系之氮素供需關係與其輪迴親臺農67號相似;另一方面,第一期作產量優於二期作,但對抽穗前預貯氮素的依賴度較高,其意義猶待探討。 The large-grain variety, Pegonil, medium-grain variety, Tainung 67 and four nearisogenic lines of the latter with higher 1,000-grain-weight...
Palavras-chave: [[classification]]6.
Ano: 1989
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溫度對不同粒重水稻品種頴果浸潤、澱粉 Taiwan Agricultural Research Institute
劉大江; 魏夢麗; 林淑雰; D.J. Liu; M.L. Wei; S.F. Lin.
[[abstract]]本試驗採用大粒型水稻品種Pegonil與中粒型栽培品種臺農67號為材料,探討溫度處理(15、25與35°C)對穎果浸潤吸水能力與澱粉分解酶活性之影響;又於生長箱及田間培育秧苗,比較在不同溫度下之生長勢,以明瞭溫度與粒重對水稻穎果及幼苗生育生理的可能作用。Pegonil單一穎果重為臺農67號之兩倍,以單一穎果為基礎表示時,其浸潤吸水速率自然較高,但澱粉分解酶活性之差異則較不顯著;如改以單位重穎果為基礎表示,在較低溫( 15°C)時Pegonil仍具有較臺農67號為高之吸水能力與酵素活性,並與高溫時之表現有異,顯示此一大粒型品種對低溫的特殊適應性。在28/20與23/15°C生長箱及第一期作田間低溫環境下,Pegonil 秧苗之苗高、葉面積、可溶性蛋白質濃度及鮮、乾物重均顯著優於臺農67號,亦即具有較佳的生長勢;秧苗C/N比值變異未能用以解釋生長勢之差異,但Pegonil品種的苗重與苗長比值較高,而高浸潤速率與澱粉分解酶活性亦可能為低溫下秧苗生長快速的部份原因。試驗結果建議應確切瞭解不同粒重水稻種源對低溫的適應性,並在耐冷性研究方面兼重存活能力與秧苗生長勢,或有助於第一期作培育適於機插之秧苗及移植後早期在低溫環境下之本田生育。 One large-grain rice variety, Pegonil and one medium-grain variety, Tainung 67 were used in this experiment to study the influence of temperature on the imbibition rate and amylase activity of caryopsis and seedling growth vigor....
Palavras-chave: [[classification]]6.
Ano: 1988
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玉米臺農351號穗頂不充實原因之探討 Taiwan Agricultural Research Institute
王強生; 曹紹徽; 劉大江; C.S. Wang; S.H. Tsao; D.J. Liu.
[[abstract]]玉米臺農351 號穗頂不充實之類型可分為四種,即穗軸頂端萎縮、穎花未受精、子粒充實不良及混合型;本試驗於吐絲期進行降低族群密度、套袋與人為授粉等處理,探討花粉供應、供源能力、積儲容積與穗內子粒間競爭養份等因素對穗頂不充實問題的影響。試驗結果發現臺農351 號玉米穗頂不充實長度為3.39cm ,占全穗長之20.1%,其中不稔部分即達2.51 cm ,唯子粒產量仍高達8.7t / ha ;降低族群密度二分之一(每公頃29,400 株)、套袋3-5 日以延遲下位子粒發育與套袋6-10 日以抑制部分下位子粒授粉充實,皆可顯著減輕穗頂不充實程度,增加充實穗長或上位子粒百粒重,但對一穗粒數與產量之提高則未具顯著效果。試驗結果顯示由於上、下位穎花與子粒在分化與發育方面的時序差異,使下位子粒具有較高的積儲強度(sink strength),對上位子粒之充實產生競爭與抑制作用。各處理植株營養器官乾物重在子粒充實期間持續上升,成熟時穗軸內非構造性碳水化合物濃度仍高,且自吐絲期開始降低族群密度並不能有效提高產量,證明臺農351 號玉米之供源能力充足,積儲容積方為產量限制因子,後者又與乾物質分配與轉流效率有關。本試驗未能證明人為輔助授粉具有減輕穗頂不充實的效果,但鑑於穗頂不稔現象,抽穗與吐絲期之時間差距,以及較長的吐絲期間,仍不能否定花粉供應可能造成的影響。試驗結論認為穗頂不充實現象為多項因子共同作用的結果,且為一品種特性,但與產量間的關係或對產量的影響並不明確,由於臺農351 號為具有高產潛力的品種,在未育成穗頂完全充實的新品種以前,仍可由適當的栽培方法達到高產的目的。 One weakness of the high-yielding, single-cross maize hybrid Tainung...
Palavras-chave: [[classification]]6.
Ano: 1985
Registros recuperados: 15
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