Root biomass fraction as a function of growth degree days in wheat

1992 ◽  
Vol 140 (1) ◽  
pp. 137-144 ◽  
Author(s):  
F. Baret ◽  
A. Olioso ◽  
J. L. Luciani
Keyword(s):  
Root Biomass ◽  
Degree Days ◽  
Growth Degree Days

scholarly journals Influencia de la temperatura en la floración de Quercus en el sur de Galicia (Ourense y Vigo, 1994-98)

2000 ◽  
Vol 25 ◽  
pp. 153-163 ◽  
Author(s):  
Javier Rodríguez-Rajo ◽  
José Méndez ◽  
María Victoria Jato
Keyword(s):  
Degree Days ◽  
Growth Degree Days ◽  
Chilling Hours

Los requerimientos necesarios para que las plantas sobrevivan a condiciones climáticas adversas son satisfechos mediante el uso de adaptaciones fisiológicas. Así, las plantas leñosas de la zona templada, para prevenir el congelamiento del agua intracelular, ralentizan su crecimiento hasta casi paralizarlo, entrando en un estado fisiológico denominado "dormancia". Muchos autores indican que el final de la fase de dormancia requiere un período de bajas temperaturas seguido de otro con temperaturas más altas. En el momento en el que los actimulos de frío y de calor son completados, se produce la floración. El objetivo de este estudio es conocer la influencia que un parámetro climático como la temperatura ejerce sobre Quercus en el sur de Galicia, para poder predecir el inicio del período de dormancia, su duración y los consecuentes requerimientos de frío y calor, para que la floración tenga lugar. En este sentido hemos elegido dos zonas con parámetros de temperatura diferentes: una zona con temperaturas suaves, Vigo y otra con temperaturas mas frías, Ourense. El monitorizaje ha sido llevado a cabo mediante el uso de un captador volumétrico tipo Hirst LANZONI VPPS 2000, de recambio semanal. Quercus comienza su período de polinación en el mes de marzo, se inicia durante la primera quincena en Vigo, y unos pocos días más tarde se produce en Ourense. Durante los cuatro años de estudio, para superar el período de dormancia Ourense necesitó una media de 778 unidades de frío (Chilling Hours) y Vigo un menor requerimiento con solamente 458 CH. En el caso del actímulo de calor, Ourense presenta el menor requerimiento con una media de 352 GDD (Growth Degree Days) y Vigo alrededor de 450 GDD.

scholarly journals Evaluation of dry matter accumulation in triticale by different sigmoidal growth models in west anatolia of turkey

Genetika ◽  
2018 ◽  
Vol 50 (2) ◽  
pp. 561-574 ◽  
Author(s):  
Onur Hocaoğlu ◽  
Yalçın Coşkun
Keyword(s):  
Growth Pattern ◽  
Dry Matter ◽  
Growth Models ◽  
Dry Matter Accumulation ◽  
Mean Square ◽  
Degree Days ◽  
Biological Growth ◽  
Growing Seasons ◽  
Growth Degree Days ◽  
Sigmoidal Growth

Monitoring biological growth of field crops is important for planning and timing agricultural practices. In order to assess biological growth pattern of dry matter accumulation in triticale Egeyildizi triticale variety were grown in ?anakkale conditions in 2012-2013 and 2013-2014 growing seasons with continuous plant samplings from seedling emergence until seed maturation. Gompertz, Logistic, Logistic Power and Richards growth models are fitted to actual growth data and their predictions were compared. Results suggested that all sigmoidal growth models successfully explained triticale dry matter accumulation over 98 % R2 values and low mean square errors, Richards model fitted best for both years with an R2 value over 99 %. Dry matter accumulation were also investigated as a result of average temperature, precipitation, growth degree days and cumulative growth degree days with stepwise regression. Rresults indicated that average weather temperature had a similar pattern across both growing seasons and had a major influence on dry matter accumulation. Since Richards sigmoidal growth model may be adequately described growth pattern of triticale by generally high R2 with lower Mean Square Error (MSE) values.

ROOT BIOMASS DATA (FIFE)

1994 ◽  
Author(s):  
T. R. SEASTED ◽  
C. L. TURNER
Keyword(s):  
Root Biomass

Effects of thinning on fine root biomass and carbon storage of subalpine Picea asperata plantation in Western Sichuan Province, China

2013 ◽  
Vol 36 (7) ◽  
pp. 645-654 ◽  
Author(s):  
Yun-Ke LIU ◽  
Chuan FAN ◽  
Xian-Wei LI ◽  
Yin-Hua LING ◽  
Yi-Gui ZHOU ◽  
...  
Keyword(s):  
Carbon Storage ◽  
Root Biomass ◽  
Fine Root ◽  
Fine Root Biomass ◽  
Sichuan Province ◽  
Western Sichuan ◽  
Picea Asperata

Root biomass distribution of triploid Populus tomentosa under wide- and narrow-row spacing planting schemes and its responses to soil nutrients

2014 ◽  
Vol 37 (10) ◽  
pp. 961-971 ◽  
Author(s):  
Nan DI ◽  
Ben-Ye XI ◽  
R. PINTO Jeremiah ◽  
Ye WANG ◽  
Guang-De LI ◽  
...  
Keyword(s):  
Soil Nutrients ◽  
Root Biomass ◽  
Populus Tomentosa ◽  
Row Spacing ◽  
Biomass Distribution ◽  
Triploid Populus Tomentosa ◽  
Narrow Row

Response of fine root biomass to changes in spatial heterogeneity of soil moisture and nitrogen in Larix principis-rupprechtii forest

2013 ◽  
Vol 36 (9) ◽  
pp. 965-972 ◽  
Author(s):  
Xiu-Yun YANG ◽  
You-Zhi HAN ◽  
Xiao-Gang WU
Keyword(s):  
Soil Moisture ◽  
Spatial Heterogeneity ◽  
Root Biomass ◽  
Fine Root ◽  
Fine Root Biomass

Evaluation of Finger Millet Varieties under Rainfed Condition of Eastern India

2017 ◽  
Vol 4 (03) ◽  
Author(s):  
M. K. Singh ◽  
VINOD KUMAR ◽  
SHAMBHU PRASAD
Keyword(s):  
Field Experiment ◽  
Finger Millet ◽  
Yield Potential ◽  
Growing Degree Days ◽  
Eastern India ◽  
Degree Days ◽  
Rainfed Condition ◽  
Net Returns ◽  
Humid Environment ◽  
Use Efficiency

A field experiment was carried out during the kharif of 2014 and 2015 to evaluate the yield potential, economics and thermal utilization in eleven finger millet varieties under the rainfed condition of the sub-humid environment of South Bihar of Eastern India. Results revealed that the significantly higher grain yield (20.41 q ha-1), net returns (Rs 25301) and B: C ratio (1.51) was with the finger millet variety ‘GPU 67’ but was being at par to ‘GPU28’and ‘RAU-8’, and significantly superior over remaining varieties. The highest heat units (1535.1oC day), helio-thermal units (7519.7oC day hours), phenothermal index (19.4 oC days day-1) were recorded with variety ‘GPU 67’ followed by ‘RAU 8’ and ‘GPU 28’ and lowest in ‘VL 149’ at 50 % anthesis stage. Similarly, the highest growing degree days (2100 oC day), helio-thermal units (11035.8 oC day hours) were noted with ‘GPU 67’ followed by ‘RAU 8’ and ‘GPU 28’ at maturity. The highest heat use efficiency (0.97 kg ha-1 oC day) and helio-thermal use efficiency (0.19 kg ha-1 oC day hour) were in ‘GPU 67’ followed by ‘VL 315’.

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