scholarly journals Response of growth patterns in sweet pepper to different NPK levels

2008 ◽  
Vol 56 (1) ◽  
pp. 241-244 ◽  
Author(s):  
Mohamed Ewis Abdelaziz ◽  
A. H. Hannfy Ahmed ◽  
R. S. Bekhid ◽  
Robert Pokluda
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Growth Analysis ◽  
Sweet Pepper ◽  
Area Ratio ◽  
Growth Patterns ◽  
Relative Growth ◽  
Mean Values ◽  
The Mean ◽  
Net Assimilation

This work was conducted to study the effect of five NPK fertigation levels on the growth rate of sweet pepper (Capsicum annuum L. cv. Bruyo) grown under the plastic greenhouse using different growth analysis formulas. Leaf area ratio (LAR), specific leaf area (SLA), relative growth rate (RGR) and net assimilation rate (NAR) was evaluated in two periods (60–90 and 90–120 days after transplanting). The mean values of LAR, SLA, RGR and NAR tended to decrease significantly with advancing plant age in both seasons. In general, at the moderate level (34N-42P-29K / plastic house 540 m2) was found the highest significant values of LAR and SLA in the two growth periods. On the other hand, the highest values of NAR were recorded at the plants treated with the lowest NPK fertigation level (17N-21P-15K / plastic house 540 m2). However, increase of NPK fertigation doses to the moderate levels had favorable effects on LAR and SLA of sweet pepper plants.

scholarly journals Fitness Cost of Imazamox Resistance in Wild Poinsettia (Euphorbia heterophylla L.)

Agronomy ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1859
Author(s):  
Saeid Hassanpour-bourkheili ◽  
Mahtab Heravi ◽  
Javid Gherekhloo ◽  
Ricardo Alcántara-de la Cruz ◽  
Rafael De Prado
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Specific Leaf Area ◽  
Dry Weight ◽  
Area Ratio ◽  
Fitness Cost ◽  
Seed Plant ◽  
Growth Indices ◽  
Relative Growth ◽  
Net Assimilation

Wild poinsettia (Euphorbia heterophylla L.) is a difficult-to-control weed in soybean production in Brazil that has developed resistance to herbicides, including acetolactate synthase inhibitors. We investigated the potential fitness cost associated to the Ser-653-Asn mutation that confers imazamox resistance in this weed. Plant height, leaf and stem dry weight, leaf area and seed production per plant as well as the growth indices of specific leaf area, leaf area ratio, relative growth rate and net assimilation in F2 homozygous resistant (R) and susceptible (S) wild poinsettia progenies were pairwise compared. S plants were superior in most of the traits studied. Plant heights for S and R biotypes, recorded at 95 days after planting (DAP), were 137 and 120 cm, respectively. Leaf areas were 742 and 1048 cm2 in the R and S biotypes, respectively. The dry weights of leaves and stems in the S plants were 30 and 35%, respectively, higher than in the R plants. In both biotypes, the leaves had a greater share in dry weight at early development stages, but from 50 DAP, the stem became the main contributor to the dry weight of the shoots. The R biotype produced 110 ± 4 seed plant−1, i.e., 12 ± 3% less seeds per plant than that of the S one (125 ± 7 seed plant−1). The growth indices leaf area ratio and specific leaf area were generally higher in the S biotype or similar between both biotypes; while the relative growth rate and net assimilation rate were punctually superior in the R biotype. These results demonstrate that the Ser-653-Asn mutation imposed a fitness cost in imazamox R wild poinsettia.

scholarly journals Plant Growth Analysis of Jack Been (Canavalia ensiformis L.) at Different Spacing to Determine the Application Time of Cutback Technology

2019 ◽  
Vol 4 (1) ◽  
pp. 1-7
Author(s):  
N. Nurmuliana ◽  
Muh. Akhsan Akib
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Growth Analysis ◽  
Assimilation Rate ◽  
Area Index ◽  
Relative Growth ◽  
Jack Bean ◽  
Canavalia Ensiformis ◽  
Bean Plants ◽  
Net Assimilation

AbstractThe growth of jack bean (Canavalia ensiformis L) is affected by genetic and environmental factors.  One of the environmental factors involved is growing space. Growing space related to each plant of areas occupied is stated by the distance between plants. A Research has been conducted as long three months in dry season with average daily temperature of 25 to 31OC on altitude of 25 to 500 meter, to determine the timing of the application of cutback technology based on an analysis of growth of jack bean plants (Canavalia ensiformis L) in different growth spaces.  The research was conducted in the trial form using a randomized block design. Variables of plants growth analysis observed is leaf area index (LAI), leaf area is computed by gravimetric method; net assimilation rate (NAR), and relative growth rate (RGR) is determined based on the dry weight of plants; in all three rooms grew, namely 75 cm x 100 cm (control), 75 cm × 75 cm and 75 cm × 50 cm, each repeated three times. The result shows that the trend of leaf area index increased at net assimilation rate (g-1.cm-2.week-1) and relative growth rate (g-1.g-1.minggu-1) decreasing at the time the plant to the age 8 weeks after planting.  The best time for the application of reduction technology to jack bean plants (Canavalia ensiformis L) in all tested growing spaces, is recommended when plants are between 7 and 8 weeks after planting

scholarly journals THE EFFECT OF MID-SEASON VINE REMOVAL ON THE GROWTH OF FIVE SWEETPOTATO (IPOMOEA BATATAS L.) CULTIVARS

HortScience ◽  
1993 ◽  
Vol 28 (4) ◽  
pp. 266E-266
Author(s):  
Victor A. Kahn ◽  
C. Stevens ◽  
T. Mafolo ◽  
C. Bonsi ◽  
J.Y. Lu ◽  
...  
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Assimilation Rate ◽  
Marketable Yield ◽  
Relative Growth ◽  
Crop Growth Rate ◽  
Mean Relative Growth Rate ◽  
The Mean ◽  
Net Assimilation

TU-82-155 and `Georgia-Jet' early maturing. `Carver II', TU-1892 and `Rojo-Blanco' late maturing sweetpotato, cultivars were evaluated in the field for 0.20 and 40% vine removal (VR) at 8 wk after transplanting. Parameters measured were: leaf area index (LAI) recovery, net assimilation rate, foliage crop growth rate (FCGR), storage roots crop growth rate (RCGR). alpha a (the mean relative growth rate in dry wt to the mean relative growth rate in leaf area over a time interval) or the partitioning of assimilates, total and marketable yield. A split. splitplot design was used and plants were sampled at 3 and 8 wk following VR. Except for TU-82-155 all cultivars showed significant LAI recovery above the control at 3 and 8 wk after vine removal when 20% of the vines were removed while at the 40% VR, only 'Georgia-Jet'. TU-1892 and 'Carver II' showed significant increases in LAI for the same periods. Net assimilation rate showed significant interactions while FCGR was not significantly affected by either 20 or 40 VR compared to the control at 3 or 8 wk after VR. RCGR was significantly affected by both levels of VR at 3 and 8 wk after VR and surplus assimilates (alpha a) showed significant interactions between cultivars and % VR. Told yield declined for all cultivars irrespective to maturity groups with the sharpest decrease being at the 20% VR. All cultivars except TU-82-155 showed a decrease in marketable yield, the increase in marketable yield of TU-82-155 was due to a lower non-marketable yield.

scholarly journals Restauración de ambientes deteriorados derivados de la selva húmeda: el uso de los hongos micorrizógenos arbusculares

2017 ◽  
pp. 59
Author(s):  
Javier Álvarez-Sánchez ◽  
Patricia Guadarrama ◽  
Irene Sánchez-Gallen ◽  
Diego Olivera
Keyword(s):  
Leaf Area ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Species Interaction ◽  
Relative Growth ◽  
Mean Values ◽  
Successional Species ◽  
Piper Auritum ◽  
The Mean ◽  
Net Assimilation

<p>The influence of arbuscular mycorrhizal fungi (AMF) on the growth and surv ival of seedlings of a light dependent (Piper auritum) and a shade tolerant (Rollinia jimenezii) tree species was analyzed in the context of degraded environments derived from the tropical rain fo rest at Los Tuxtlas, Veracruz, Mexico. An experiment with three factors , soil (from tropical rain forest or pasture), mycorrhization (with or without AMF), and species was carried out in agreenhouse. A classical growth analysis was performed with seven variables , and ANOVAs showed significant differences for dry leaf weight, Leaf Area Ratio and Net Assimilation Rate (NAR); the AMF × species interaction was particularly important. After 120 days, seedlings we retransplanted into two sites within a pasture and randomly placed according to the tre atment factors; seedlings we re harvested after seven months. In this second experiment, Piper obtained the largest mean values and was significantly different from Rollinia, wh e reas the soil factor did not produce any significant differences, and the factor mycorrhization only produced differences in three variables; seedlings without AMF (M-) had the highest Relative Growth Rate (RGR) and Specific Leaf Area (SLA) values, whereas those<br />with the AMF (M+) treatment had the largest TAN values. The AMF × species interaction was significant, the higher values being those obtained for Piper without AMF. The triple interaction was significant only for RGR, the mean being smaller and different for Rollinia with mycorrhizae in fo rest soil. However, survival did increase under AMF tre atments for Rollinia and for Piper growing on pasture soil. We recommend the use of both pioneer and late successional species for ecological restoration; in particular, Piper and Rollinia seedlings should be inoculated with AMF, as this procedure increases their survival after transplanting</p>

scholarly journals Quantitative Analysis of Greenhouse Kohlrabi (Brassica oleracea var. gongylodes L.) Growing

2017 ◽  
Vol 5 (2) ◽  
Author(s):  
Harun Özer ◽  
Mehtap Özbakır Özer ◽  
Ahmet Balkaya
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Dry Weight ◽  
Area Ratio ◽  
Assimilation Rate ◽  
Sowing Time ◽  
Relative Growth ◽  
Total Plant ◽  
Seed Sowing ◽  
Net Assimilation

This study were carried out to of different sowing time in order to determine the effects on plant growth of kohlrabi cultivation under Samsun condaitions during the autumn growing periods in unheated greenhouse. Four different seed sowing times (1st September, 15th September 1st October, 15th October), two different kohlrabi cultivars (Kolibri F1 and Korist F1) and two mulch applications (mulch covered and uncovered) were used in this study.The plant growth parameters analyzed (total plant dry weight, leaf area ratio, specific leaf area, net assimilation rate and relative growth rate) were found statistically significant (p<0.05). The highest total plant dry weight (114.1 g) was obtained from mulch application and 1st September seed sowing time. The highest leaf area ratio value were obtained in both mulch application the Kolibri F1 variety grown on October 15th. The highest net assimilation rate (0.65 g cm-2 day-1*1000) and relative growth rate (0.0090 g g day-1) were obtained from mulch covered plants grown in Kolibri varieties during September 1st. As a result, in this study higher dry matter accumulation was achieved by 1st September seed sowing times in vegetable growing in the last season in the greenhouse. In this way, the plants have successfully grown up and increased their productivity by entering the winter months, when the temperature and light intensity are decreasing.

scholarly journals Growth Analysis of Sourgrass: Does Herbicide Resistance Affect Its Development?

2019 ◽  
Vol 11 (11) ◽  
pp. 214
Author(s):  
Fernando Storniolo Adegas ◽  
Dionísio Luiz Pisa Gazziero ◽  
Alexandre Ferreira da Silva ◽  
Germani Concenço
Keyword(s):  
Leaf Area ◽  
Growth Analysis ◽  
Management Strategies ◽  
Dry Mass ◽  
Area Ratio ◽  
Initial Growth ◽  
Factor B ◽  
Relative Growth ◽  
Net Assimilation ◽  
Mass Accumulation

Sourgrass (Digitaria insularis) is highlighted as one of the most troublesome weeds in Brazilian agriculture. The growth analysis of the species and biotypes with resistance to glyphosate are preponderant to support management strategies. In this way, the aim of this work is to compare the growth of biotypes resistant and susceptible to glyphosate, and to characterize the species growth in field conditions. The greenhouse experiment was installed in randomized blocks design, in factorial scheme 2 &times; 10, with eight replications. Factor A comprised the biotypes, and factor B the fortnight evaluations. The dry mass of roots, stems, leaves and shoot were assessed, besides leaf area and plant height. From these variables, the relative growth rate, net assimilation rate and leaf area ratio were calculated. For the field experiment, the same variables were assessed and the same parameters were calculated, without distinction on resistant or susceptible biotype. The biotype with resistance to glyphosate did not show adaptative disadvantages compared to the susceptible one. In this way, it is necessary to prevent the entry of resistant biotypes in cropped fields, as once established the area may not naturally return to the initial frequency of susceptible biotypes. Sourgrass shown slow initial growth and dry mass accumulation up to 42 days after emergence, indicating that control of this specie should be performed preferably before this period.

scholarly journals GROWTH ANALYSIS OF FIVE SWEETPOTATO (IPOMOEA BATATAS L) CULTIVARS

HortScience ◽  
1993 ◽  
Vol 28 (4) ◽  
pp. 267E-267
Author(s):  
Victor A Khan ◽  
C. Stevens ◽  
T. Mafolo ◽  
C. Bonsi ◽  
J.Y. Lu ◽  
...  
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Assimilation Rate ◽  
Relative Growth ◽  
Crop Growth Rate ◽  
Early Maturing ◽  
Mean Relative Growth Rate ◽  
The Mean ◽  
Net Assimilation ◽  
Maturity Groups

TU-82-155 and `Georgia-Jet' early maturing. `Carver II'. TU-1892 and `Rojo-Blanco' late maturing sweepotato cultivars were evaluated in the field for: leaf area index (LAI), net assimilation rate, foliage crop growth rate (FCGR), storage roots crop growth rate (RCGR) and alpha a (the mean relative growth rate in dry wt to the mean relative growth rate in leaf area over a time interval) or the partitioning of assimilates. A split plot design was used and plants were sampled at 6, 8, 11 and 16 wk after transplanting. The results from study showed that LAI reached maximum development 8 and 12 wk after transplanting for early and late maturing cultivars, respectively. All cultivars irrespective to maturity groups showed a reduction in net assimilation rate 6 wk after transplanting while FCGR for early maturing cultivars gradually declined 6 wk after transplanting and varied among late maturing cultivars. `Carver II' showed increases in FCGR up to 11 wk after transplanting then rapidly declined while `Rojo-Blanco' and TU-1892 began to decline 8 and 6 wk after transplanting, respectively. RCGR showed rapid increases (100 g.m /area/week) and (150 g/m /area/week) for early and late maturing cultivars beginning 6 wk after transplanting and this increase continued until the 12th and 8 th wk after transplanting for early and late maturing cultivars, respectively. Cultivars from both maturity groups began to produce surplus assimilates (Alpha a) 6 wk after transplanting. which coincided with the rapid increases in RCGR at the same time. Thus indicating that storage root enlargement begins after the plant had accumulated a surplus of assimilates.

SOME DIFFERENCES BETWEEN SOYBEAN CULTIVARS OBSERVED BY GROWTH ANALYSIS

1972 ◽  
Vol 52 (1) ◽  
pp. 13-20 ◽  
Author(s):  
B. R. BUTTERY ◽  
R. I. BUZZELL
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Growth Analysis ◽  
Leaf Growth ◽  
Plant Weight ◽  
Relative Growth ◽  
Glycine Max L ◽  
Transgressive Segregants ◽  
Net Assimilation ◽  
Highly Correlated

Spaced plants of soybean (Glycine max (L.) Merrill) cultivars were subjected to classical growth analysis. Varietal differences in mean net assimilation rate (NAR), relative growth rate (RGR), relative leaf growth rate (RLGR), leaf area ratio (LAR), specific leaf weight (SLW), and shoot/root ratio (S/R) were detected within a group of 21 cultivars grown in three tests over 3 years. Only LAR and SLW differed within another group of 23 cultivars grown in 2 years. Comparisons of cultivars with their parents showed that selection for yield had resulted in increased NAR and SLW, and in decreased LAR, S/R, plant weight, and leaf area. Many of the cultivars were transgressive segregants for higher NAR and SLW and for lower LAR. Phenotypic correlations showed that NAR was highly correlated with SLW and inversely correlated with LAR. SLW might be a useful character for indirect selection of soybean yield.

scholarly journals The Contribution by Leaves of Different Age to New Growth of Subterranean Clover Plants Following the Removal of a Sulphur Stress I. Origin and Distribution of Dry Matter

1972 ◽  
Vol 25 (6) ◽  
pp. 1147 ◽  
Author(s):  
D Bouma ◽  
EAN Greenwood ◽  
EJ Dowling
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Dry Matter ◽  
Subterranean Clover ◽  
Area Ratio ◽  
Assimilation Rate ◽  
Relative Growth ◽  
Net Assimilation ◽  
Nutrient Solutions

During the first 3 days after transfer of moderately sulphur-deficient plants (S1) to full nutrient solutions, the relative growth rate (Rw) was considerably lower than that of plants raised at higher sulphur levels (S2 and Sa). This was reflected in a lower leaf area ratio of the S1 plants, and particularly in a reduction of nearly 50% in the net assimilation rate (EA). Net losses in dry matter from younger emerged leaves and petioles accounted for 25% of the dry matter in new leaves and petioles of S1 plants produced during this period.

Sign in / Sign up

Export Citation Format

Share Document