scholarly journals Assessment of ratoonability of short-duration pigeonpea genotypes

1996 ◽  
Vol 127 (3) ◽  
pp. 331-335 ◽  
Author(s):  
Y. S. Chauhan ◽  
C. Johansen ◽  
S. C. Gupta
Keyword(s):  
Leaf Area ◽  
Short Duration ◽  
Cajanus Cajan ◽  
Andhra Pradesh ◽  
Total Yield ◽  
Area Index ◽  
Main Crop ◽  
Relationship Of ◽  
The Relationship ◽  
Crop Maturity

SUMMARYThe extent of variation in ratoonability was examined in a range of recently bred short-duration pigeonpea [Cajanus cajan (L.) Millsp.] genotypes in 1989/90, 1990/91 and 1991/92 at the ICRISAT Asia Center, Andhra Pradesh, India. Traits with which this variation could be associated were assessed. Differences in the total ratoon yield of two flushes were significant among the genotypes in each season. In a few genotypes, ratoon yield constituted 50% of the total yield, which could be as high as 5·6 t/ha. Total ratoon yield was positively correlated with leaf area index in the last 2 years of experimentation. The relationship of total ratoon yield to main crop yield was significantly positive in 1991/92 only. The results suggest that there is a large variation in ratoonability among short-duration genotypes and that high leaf area retention at main crop maturity appears to contribute substantially to this variation.

On the relationship of NDVI with leaf area index in a deciduous forest site

2005 ◽  
Vol 94 (2) ◽  
pp. 244-255 ◽  
Author(s):  
Quan Wang ◽  
Samuel Adiku ◽  
John Tenhunen ◽  
André Granier
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Deciduous Forest ◽  
Forest Site ◽  
Area Index ◽  
Relationship Of ◽  
The Relationship

scholarly journals Relating X-band SAR Backscattering to Leaf Area Index of Rice in Different Phenological Phases

2019 ◽  
Vol 11 (12) ◽  
pp. 1462 ◽  
Author(s):  
Sonia Asilo ◽  
Andrew Nelson ◽  
Kees de Bie ◽  
Andrew Skidmore ◽  
Alice Laborte ◽  
...  
Keyword(s):  
Leaf Area Index ◽  
Linear Relationship ◽  
Leaf Area ◽  
P Value ◽  
Area Index ◽  
Dynamic Relationship ◽  
Reproductive Phase ◽  
X Band ◽  
Relationship Of ◽  
The Relationship

The objective of this study is to provide complete information on the dynamic relationship between X-band (3.11 cm) backscattering intensity (σ°) and rice crop’s leaf area index (LAI) at all growth phases. Though the relationship between X-band σ° and LAI has been previously explored, details on the relationship at the reproductive phase remain unstudied. LAI at the reproductive phase is important particularly at the heading stage where LAI reaches its maximum as it is closely related to grain yield, and at flowering stage where the total leaf area affects the amount of photosynthates. Therefore, this study examined the relationship of increasing LAI (vegetative to reproductive phase) and decreasing LAI (ripening phase) with TerraSAR-X (TSX) ScanSAR (3.11 cm) σ° at HH polarisation and 45° incidence angle. The results showed a statistically significant (R2 = 0.51, p value < 0.001) non-linear relationship of LAI with σ° at the vegetative to reproductive phase while no significant linear relationship was found at the ripening phase. This study completes the response curve of X-band σ° to LAI by filling in the information on the reproductive phase which more accurately characterises the dynamic relationship between the rice crop’s LAI and X-band’s σ°. This contributes to improved knowledge on the use of X-band data for estimating LAI for the whole crop cycle which is essential for the modelling of crop growth and estimation of yield.

scholarly journals Apple Δ13C Discrimination Is Related to Shoot Ash Content

HortScience ◽  
2011 ◽  
Vol 46 (2) ◽  
pp. 213-216 ◽  
Author(s):  
D. Michael Glenn ◽  
Carole Bassett
Keyword(s):  
Leaf Area ◽  
Ash Content ◽  
Yearly Variation ◽  
Area Index ◽  
Grassland Species ◽  
Malus Sieversii ◽  
Period 2 ◽  
Highly Correlated ◽  
Relationship Of ◽  
The Relationship

Plant ash content has been highly correlated with plant water use efficiency (WUE) and Δ13C (Δ) in field crops and grassland species and proposed as a selection criteria for WUE. δ18O (δ) has also been correlated with transpiration in herbaceous plants. The objectives of the study were to 1) evaluate the relationship of shoot ash (ASH) with Δ and δ in ‘Empire’ apple over a 3-year period; 2) determine if yearly variation significantly affected the relationship of ASH with Δ and δ; and 3) evaluate the value of the relationship between ASH content with Δ and δ for a population of Malus sieversii. ‘Empire’ leaf area index (LAI) was negatively correlated with ASH content and positively correlated with Δ. Δ was negatively correlated with ‘Empire’ ASH. There were no yearly effects at a site. Within the Malus sieversii accessions, there was a grouping based on ASH that could be identified and this outlier group also had the lowest δ of the accessions. There were no correlations of leaf area, number, length, width, or stomata number with δ, Δ, or ASH for the Malus sieversii accessions. Rather than a substitute for Δ measurement in assessing WUE, ash content analysis adds an additional dimension to understanding the dynamics of WUE in apple. This work has identified a unique population of Malus meriting further study.

scholarly journals Growth Analysis of Watermelon Plants Grown with Mulches and Rowcovers

1995 ◽  
Vol 120 (6) ◽  
pp. 1001-1009 ◽  
Author(s):  
Nader Soltani ◽  
J. LaMar Anderson ◽  
Alvin R. Hamson
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Growth Analysis ◽  
Citrullus Lanatus ◽  
Total Yield ◽  
Carbon Dioxide Concentration ◽  
Male Flower ◽  
Female Flower ◽  
Plastic Mulch ◽  
Area Index

`Crimson Sweet' watermelon [Citrullus lanatus (Thunb.) Matsum. & Nakai] plants were grown with various mulches and rowcovers and analyzed for relative growth rate (RGR), net assimilation rate (NAR), specific leaf area (SLA), leaf area index (LAI), and crop growth rate (CGR). Spunbonded polyester fabric (SB-PF) and perforated polyethylene film (PCP) rowcovers generally showed greater mean RGR, SLA and CGR than spunbonded polypropylene polyamide net (SB-PP), black plus clear combination plastic mulch and black plastic mulch alone. Plants on mulches and under rowcovers showed significant increases in RGR, NAR, and SLA over plants grown in bare soil. Carbon dioxide concentration inside the transplanting mulch holes was nearly twice the ambient CO, concentration. Growth analysis of sampled watermelon plants during early stages of development under various treatments was predictive of crop yield. Plants under SB-PF and PCP rowcovers produced the earliest fruit and the greatest total yield. An asymmetrical curvilinear model for watermelon growth and development based on cardinal temperatures was developed. The model uses hourly averaged temperatures to predict growth and phenological development of `Crimson Sweet' watermelon plants grown with and without rowcovers. Early vegetative growth correlated well with accumulated heat units. Results indicate a consistent heat unit requirement for the `Crimson Sweet' watermelon plants to reach first male flower, first female flower and first harvest in uncovered plants and plants under rowcovers. Greater variability was observed in predicting date of first harvest than first bloom.

Relationship between tillering and leaf area index: quantifying critical leaf area index for tillering in rice

2002 ◽  
Vol 138 (3) ◽  
pp. 269-279 ◽  
Author(s):  
X. ZHONG ◽  
S. PENG ◽  
J. E. SHEEHY ◽  
R. M. VISPERAS ◽  
H. LIU
Keyword(s):  
Leaf Area Index ◽  
Leaf Area ◽  
Planting Density ◽  
Coefficient Of Determination ◽  
Area Index ◽  
N Input ◽  
Major Factors ◽  
The Relationship ◽  
Changing Light ◽  
Input Level

A field study was conducted at the International Rice Research Institute (IRRI), Philippines during the dry seasons of 1997 and 1998 under irrigated conditions. The objectives of this study were to quantify the critical leaf area index (LAIc) at which tillering stops based on the relationship between tillering rate and LAI, and to determine the effect of nitrogen (N) on LAIc in irrigated rice (Oryza sativa L.) crop. Results showed that the relative tillering rate (RTR) decreased exponentially as LAI increased at a given N input level. The coefficient of determination for the equation quantifying the RTR-LAI relationship ranged from 0·87 to 0·99. The relationship between RTR and LAI was affected by N input level, but not by planting density. The N input level had a significant effect on LAIc with a high N input level causing an increase in LAIc. Tillering stopped at LAI of 3·36 to 4·11 when N was not limiting. Under N limited conditions LAIc reduced to as low as 0·98. Transplanting spacing and number of seedlings per hill had little effect on LAIc. Results from this study suggest that LAI and plant N status are two major factors that influence tiller production in rice crops. The possibility that LAI influences tillering by changing light intensity and/or light quality at the base of the canopy where tiller buds and young tillers are located is discussed.

scholarly journals The relationship of leaf photosynthetic traits -VcmaxandJmax- to leaf nitrogen, leaf phosphorus, and specific leaf area: a meta-analysis and modeling study

2014 ◽  
Vol 4 (16) ◽  
pp. 3218-3235 ◽  
Author(s):  
Anthony P. Walker ◽  
Andrew P. Beckerman ◽  
Lianhong Gu ◽  
Jens Kattge ◽  
Lucas A. Cernusak ◽  
...  
Keyword(s):  
Leaf Area ◽  
Specific Leaf Area ◽  
Meta Analysis ◽  
Leaf Nitrogen ◽  
Relationship Of ◽  
The Relationship ◽  
Photosynthetic Traits ◽  
Modeling Study

scholarly journals Biomass allocation in natural regeneration of Fagus sylvatica and Picea abies trees in Italian Alps

2014 ◽  
Vol 61 (1) ◽  
pp. 35-46 ◽  
Author(s):  
Fabio Pastorella ◽  
Alessandro Paletto
Keyword(s):  
Leaf Area ◽  
Norway Spruce ◽  
Biomass Allocation ◽  
Growth Stages ◽  
Area Index ◽  
Ground Biomass ◽  
Non Linear ◽  
Below Ground ◽  
The Relationship ◽  
Linear Regressions

Abstract Biomass allocation in seedlings and saplings at different stages of growth is important information for studying the response of species to site conditions. The objectives of the paper are: (a) to analyse the relationship between height and biomass in young Norway spruce and European beech trees, (b) to study the influence of the leaf area on ontogenetic growth stages and biomass sequestration capacity on the regeneration of these two species. 96 seedlings (H < 30 cm) and saplings (31 < H < 130 cm) were collected in different light conditions in a case study in the Alps (Trentino province, Italy). Leaf Area Index and shoot/root ratio were used as indicators of the ecological conditions (e.g. light, soil moisture, nutrient status) able to influence the seedlings and saplings growth. Two non-linear regressions were fitted to analyse the relationship between height and biomass and to develop the aboveground and below-ground allometric equations. Non-linear regressions show that sapling or seedling height is a good predictor of above-ground and below-ground biomass with a R2aj above 0.8 for all equations and a R2aj above 0.9 for above-ground biomass of Norway spruce. The results show that silvicultural practices may influence the regeneration patterns and increase the biomass allocation rate influencing stand density and canopy cover.

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