scholarly journals Impact of water deficit stress on biomass production of different gladiolus cultivars under rainfed condition

2015 ◽  
pp. 10-13
Author(s):  
Ranjan Das, Kaushik Bhagawati, Alpana Boro, Tulika Medhi
Keyword(s):  
Plant Growth ◽  
Leaf Area ◽  
Water Deficit ◽  
Biomass Production ◽  
Crop Production ◽  
Net Assimilation Rate ◽  
Water Deficit Stress ◽  
Assimilation Rate ◽  
Leaf Area Duration ◽  
Net Assimilation

Among the environmental stresses, water deficit stress was recognized to be one of the most adverse factors for plant growth and productivity. The study aimed to comparatively evaluate impact of water deficit stress on biomass of seven cultivars of gladiolus in terms of leaf area duration and net assimilation rate under rainfed conditions in northeastern region of India. Also, productions in terms of marketable spikes were compared. The parameters were measured using standard procedures. Comparatively higher leaf area duration (116 days) and net assimilation rate were found in cultivars Aarti (116 days and1.62 gcm-2day-1x10-3 respectively) and Suchitra (98.0 days and 1.10 gcm-2day-1x10-3) which account for their higher biomass production with larger spike size with good numbers of flowers. The highest marketable spikes (71111.11 spikes ha-1) was found in cultivar Aarti followed by Suchitra (68148.14 spikes ha-1) which might be due to its comparatively higher biomass production and less deviation, during stress condition, from normal characteristics. The tolerant cultivars are those that can adapt to the change without much change in their normal growth. And the responses of those species are commercially acceptable that promote adaptation without compromising much with the plant growth and crop production.

scholarly journals Crescimento de crambe na presença ou ausência de competição interespecífica

Revista CERES ◽  
2015 ◽  
Vol 62 (5) ◽  
pp. 460-468 ◽  
Author(s):  
Germani Concenço ◽  
Luiz Alberto Staut ◽  
Igor Vinicius Talhari Correia ◽  
Luiz Carlos Yamamoto Vieira ◽  
César José da Silva
Keyword(s):  
Leaf Area ◽  
Growth And Development ◽  
Dry Mass ◽  
Net Assimilation Rate ◽  
Assimilation Rate ◽  
Mass Ratio ◽  
Leaf Mass ◽  
Leaf Mass Ratio ◽  
Leaf Area Duration ◽  
Net Assimilation

RESUMOCrambe (Crambe abyssinica) has a cropping cycle of around 90 days, being suitable as an alternative to the second grain crop planted after soybean is harvested in the Center West region of Brazil. It is necessary to understand the growth and development dynamics of crambe plants in order to allow correct management of the production factors. This study aimed to describe the growth and development parameters of crambe plants under presence or absence of interspecific competition. The experiment was installed in the fall-winter 2011 in an Oxisoil, in completely randomized blocks design with three replications. Treatments comprised crambe plants growing either in presence or absence of interspecific simulated competition, throughout the cropping cycle. Plants were collected for the growth analysis every 15 days from harvest until 75 days after emergence. Growth parameters leaf area (AF), dry mass of stems/culms (MSC), leaves (MSF) and total (MST) dry mass, leaf area index (IAF), absolute (TCA) and relative (TCR) growth rates, net assimilation rate (TAL), specific leaf area (AFE), leaf area duration (DAF), leaf area ratio (RAF) and leaf mass ratio (RMF) were determined for the crop plants, subjected or not to competition, as well as for the simulated competitor. Crambe is a low competitive crop, being the competition more severe until 60-70 days after emergence. Besides, crop performance under field conditions was properly described by the net assimilation rate (TAL), which is also affected by the leaf area duration (DAF) and leaf mass ratio (RMF).

scholarly journals Analysis of Plant Growth and Yield in Varieties of Tomato (Solanum lycopersicum L.) Grafted onto Different Eggplant Rootstocks

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Evy Latifah ◽  
Amik Krismawati ◽  
Mohammad Saeri ◽  
Zainal Arifin ◽  
Bas Warsiati ◽  
...  
Keyword(s):  
Growth Rate ◽  
Plant Growth ◽  
Leaf Area ◽  
Relative Growth Rate ◽  
Net Assimilation Rate ◽  
Growth And Yield ◽  
Assimilation Rate ◽  
Relative Growth ◽  
Tomato Plants ◽  
Net Assimilation

This study aimed to examine plant growth of tomato grafted onto different eggplant rootstocks. We applied a randomized block design comprising twelve treatments with three replicates. Three varieties of tomato—Cervo, Karina, and Timoty—and three rootstocks—Gelatik, EG203 line, and Solanum torvum—were selected for this study. Nongrafted tomato plants of the same varieties were used as controls. The variables recorded were the number of branches, the diameter of scions and rootstocks, root length, and root dry weight at 4, 6, 8, and 10 weeks after planting (WAT) and relative growth rate, specific leaf area, and net assimilation rate at 4, 8, and 12 WAT. Grafted tomato plants demonstrated better growth than controls. There was a significant relationship between yield, plant growth parameters, and photosynthetic organs, expressed by higher production, greater scion diameter, longer roots, and increased relative growth rate, leaf area ratio, and net assimilation rate of grafted plants, compared to the controls.

scholarly journals Functional growth analysis of diploid potato cultivars (Solanum phureja Juz. et Buk.)

2020 ◽  
Vol 14 (3) ◽  
pp. 402-415
Author(s):  
Tatiana María Saldaña-Villota ◽  
José Miguel Cotes-Torres
Keyword(s):  
Plant Growth ◽  
Leaf Area ◽  
Growth Analysis ◽  
Potato Cultivars ◽  
Net Assimilation Rate ◽  
Diploid Potato ◽  
Assimilation Rate ◽  
Degree Days ◽  
Net Assimilation ◽  
Accumulated Degree Days

Plant growth analysis has been widely used to study factors that influence plant growth. This analysis uses a set of quantitative methods that describe and analyze the growth of plants and their organs. It uses data from direct measurements (weight, area, volume) and quantifies and analyzes growth using indexes based on models defined by mathematical functions. This study conducted a functional growth analysis of diploid potato cultivars in Colombia. The functional growth analysis of diploid potato cultivars was carried out over three consecutive growing seasons in Medellín, Colombia. A randomized block design was used with two levels of fertilization and five repetitions. The first factor corresponded to the three potato cultivars, and the second factor was two fertilization levels: 260 and 778 kg of fertilizer per hectare. Samples were taken weekly, and each sample was an entire plant per experiment unit. The dry weight of each organ and the leaf area were measured. These measurements were used to calculate the relative growth rate, leaf area ratio, net assimilation rate, and specific leaf area. The development time was evaluated in accumulated degree-days with threshold temperatures of 2 and 29°C. The three cultivars recorded their highest net assimilation rate at 1,252 accumulated degree days (ADD), with values of 0.0002565, 0.0002021, and 0.0001778 g cm-2 ADD-1 in the ‘Latina’, ‘Guaneña’, and ‘Colombia’ cultivars, respectively. The Latina cultivar stood out in several physiological characteristics, including the fastest developing cultivar. ‘Latina’ also had the highest total dry mass accumulated in the cycle (271.05 g) and accumulated dry matter in tubers (237 g).

The growth of maize

1978 ◽  
Vol 90 (3) ◽  
pp. 569-577 ◽  
Author(s):  
G. O. Iremiren ◽  
G. M. Milbourn
Keyword(s):  
Leaf Area ◽  
Dry Matter ◽  
Matter Content ◽  
Net Assimilation Rate ◽  
Dry Matter Content ◽  
Dry Matter Yield ◽  
Assimilation Rate ◽  
Maize Silage ◽  
Area Index ◽  
Net Assimilation

SummaryTotal dry-matter yield of maize silage rose asymptotically as density was increased up to 17 plants/m2. Over the range 11–17 plants/m2, which is generally higher than is used in the U.K., the increase in yield was 1–1·6 t dry matter/ha which can justify the higher seed cost and although there was no adverse affect on time of maturity the risk of lodging increased at the highest density. During the harvest period whilst whole crop dry-matter percentage was rising from 23 to 28%, the ear dry-matter content rose steadily from 29 to 35%, whereas the leaf and stem dry-matter content remained essentially constant and only dried out at a later stage after a frost.Caldera 535 had a higher leaf area index and net assimilation rate than the earlier variety Julia which it outyielded by 15%. The additional yield was mainly stem tissue and the greater vegetative production caused an 11-day delay in reaching the silage stage of maturity (25% crop D.M.). NO differences occurred between density treatments and varieties in the forage quality components considered, namely percentage drymatter digestibility, modified acid-detergent fibre, crude protein and ash. Thus in U.K. conditions, total dry-matter yield exerts an overriding influence on the yields per unit area of these quality constituents. This contrasts with reports from the U.S.A. in which a reduced grain/stover ratio adversely influences silage quality.Removal of the whole ear (including husk and rachis) at an early stage in ear development resulted in a 50% reduction in the final dry-matter yield. In the earless plants, leaf area and net assimilation rate was lower, but the dry-matter content of the leaves and stem was considerably higher, and a marked purple coloration developed indicative of excess starch concentration. These results emphasize the need in maize silage not only for an adequate leaf canopy, best obtained early in the growing season by using high planting density and subsequently by using late maturing varieties, but also for sufficient sink capacity in the ear as well as in the stem fraction.

Sign in / Sign up

Export Citation Format

Share Document