1) SPAD threshold
SPAD阈值
1.
Different fertilizer-N doses were covered based on RTNM and SSNM with various proposed SPAD thresholds.
两优培九SPAD阈值分别由34～45的RTNM模式下,当SPAD阈值介于38～41之间时(氮肥用量120～165kgN·ha-1)可以改善稻米的外观品质和加工品质;汕优63则以SPAD阈值36～39(氮肥用量:120～165kgN·ha-1)范围内有利于改善米质。
2) SPAD value
SPAD值
1.
Behavioral responses of Toxoptera aurantii to green colors with different SPAD values;
茶蚜对不同SPAD值绿色的趋性
2.
The results showed that variable fluorescence(Fv),maximal fluorescence(Fm),potential activity of PSⅡ(Fv/Fo),quantum yield of PSⅡ linear electron(ΦPSⅡ),coefficient of photochemical fluorescence quenching(qP),actual photochemical efficiency of PSⅡ(Yield) and SPAD value of P.
结果表明:高节竹、红哺鸡竹、斑竹、金镶玉竹、黄秆乌哺鸡、绿皮黄筋的SPAD、可变荧光(Fv)、最大荧光(Fm)、PSⅡ最大光化学效率或原初光能转换效率(Fv/Fm)、PSⅡ的潜在活性(Fv/Fo)、PSⅡ电子传递量子产率(ΦPSⅡ)、光化学猝灭系数(qP)、PSⅡ实际光化学效率(Yield)等值均高于其他7个竹种,非光化学猝灭系数(qN)值相对较低,即这6个竹种具有较好的光合生理功能,可为优选观赏竹种;相关分析表明:Fv、Fm、Fv/Fo、Fv/Fm、Yield、qP、ΦPSⅡ与SPAD值呈正相关,qN与SPAD及其他荧光参数均呈(极)显著负相关。
3.
Pot experiments were conducted by using Euchlaena Mexicana Schard applied with 5 nitrogen levels in different time periods to investigate the correlation among the SPAD value,agro-traits and quality of E.
设计5个氮肥水平的盆栽试验,并测定不同时期和不同氮肥水平墨西哥玉米的SPAD值和部分农艺性状,以探讨墨西哥玉米的SPAD值与部分农艺性状与品质的相关性。
3) SPAD values
SPAD值
1.
The objective of this research was to investigate the positional distribution of SPAD values of the main-stem leaves and their relationships with the nitrogen content of cotton(Gossypium) leaves.
选用美棉33B和泗棉3号两个叶色深浅差异明显的品种,设置氮素水平(0、120、240、360和480 kg hm-2纯氮)试验,研究棉花主茎叶SPAD值的叶位分布,对棉花进行氮素营养诊断。
2.
The results showed that the SPAD values of different parents flag leaf existed considerable difference,the parent existed considerable difference at different growth stages too.
利用3个粳稻BT型不育系和6个粳型恢复系,配制不完全双列杂交组合,采用加性-显性-上位性遗传模型,分析在不同发育时期剑叶SPAD值的遗传效应。
3.
At tuber initiation stage, tuber bulking stage and tuber starch accumulation stage, both leaf SPAD values and leaf nitrogen contents varied with nitrogen fertilization levels in linear-plateau regression modes, therefore SPAD value could be a good indicator of potato nitrogen nutrition status.
以马铃薯品种克新1号为材料,研究了叶片SPAD值、叶片全氮含量、叶绿素含量以及块茎产量随供氮水平的变化规律及相互关系,旨在为使用叶绿素仪进行马铃薯无损伤氮素诊断和推荐施肥奠定基础。
4) SPAD
SPAD值
1.
SPAD Value of Leaf at Different Positions on Main Stem in Potato as Influenced by Temperature and Photoperiod;
不同温光条件下马铃薯不同叶位叶SPAD值变化规律研究
2.
Effect of Nitrogen on SPAD and Photosynthesis Rate of Different Leaves of Winter Wheat at Grain Filling Stage;
施氮对灌浆期冬小麦不同叶片SPAD值及光合速率的影响
3.
Study on the Relation between Content N and SPAD in Bamboo s Leaf;
毛竹叶片N含量与SPAD值的相关性研究
5) SPAD readings
SPAD值
1.
Relationship between SPAD readings chlorophyll contents and yield of potato(Solanum tubersosum L.);
马铃薯叶片SPAD值与叶绿素含量及产量的相关性研究
2.
Study on Correlations Between SPAD readings and Chlorophyll Content in Leaves of Sweet Potato,Dioscorea and Konjaku
甘薯、薯蓣和魔芋叶片SPAD值与叶绿素含量的相关性研究
3.
In order to seek the best agent for plant chlorophyll extraction and determinate the relationship between chlorophyll content and SPAD readings, two varieties, K326 and Honghuadajinyuan (HD), were used in this study.
本实验选用两个烤烟品种K326和红花大金元(HD),分别在移栽后的45d和50d,进行不同试剂叶绿素提取效果的比较研究;并在移栽后的50d、67d和68d进行了叶片叶绿素含量与SPAD值的关系研究。
6) chlorophyll SPAD value
叶绿素SPAD值
1.
Field experiment was conducted to study the effect of 17-year long-term mixed application of organic-inorganic fertilizations on chlorophyll SPAD value of the flag leaves,the top 2nd leaves and the top 3rd leaves of early rice in early-tilling,peak-tilling,full-heading,milk ripe,waxy-ripening and ripening stage.
结果表明,与NPK处理相比,有机-无机肥配施分别使早稻分蘖始期和分蘖盛期倒二叶叶绿素SPAD值提高1。
补充资料：地理阈值
亦称地理临界值。它将地理系统中的不同状态加以分隔与区分，把某一性质的表现范围加以限制和说明。在此种意义上，地理阈值代表了系统的“状态空间”的非连续性。在一般叙述中，常把地理阈值等同于地理系统边界条件，但二者是有区别的：如果两种不同的状态同时存在于相同的边界条件之中时，地理阈值的表现可能是“非传递性”的转移；而当两种不同状态分置于不同的边界条件之中时，地理阈值的表现可能是“过渡性”地转移。无论是非传递性转移的地理阈值，还是过渡性转移的地理阈值，都使地理系统中不可能具备唯一的、通用的或稳定的解。所谓“解”都是有条件的，都是在地理阈值约束下的解。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条