An analysis of the plant growth speed throughout the day
An analysis of the plant growth speed throughout the day
On each collection date, the plants were clipped close to the ground and manually separated into component organs roots, leaves, culms and inflorescences , and each fraction was separately placed in brown paper envelopes. The plants that were maintained under field capacity presented an assimilate distribution throughout development, with leaves as the structures that are responsible for the better allocation of assimilates until 84 DAE, followed by culms and roots Fig. Rye plants that were not subjected to waterlogging had a higher dry matter, dry matter production rates and harvest index compared to the plants under the effect of two soil waterlogging periods. Total dry matter a , dry matter production rate b , relative growth c , net assimilation d , leaf area index e , leaf area ratio f , leaf mass g and specific leaf area h of rye plants Secale cereale L. The leaf area ratio Fw was indifferent to the treatment and was superior and maximum at 28 DAE, being superior in the plants that were under a single waterlogging in comparison to the remaining plants Fig. Hence the variables measured in each experiment were classified as originally homoscedastic, transformed homoscedastic originally heteroscedastic, homoscedastic after transformation , or transformed heteroscedastic originally heteroscedastic, heteroscedastic after transformation. Shoots, roots and nodules were separately dried and weighed, and N and P concentrations were measured in roots and shoots. Another subject is concerned to the choice of the appropriate model of analysis of variance ANOVA model. According to Aumonde et al. The experiment millet cultivars had a splitplot design, with cultivar as main plot and harvest as subplot. Figure 2. Over a longer period weeks to months , RGR will generally decrease because of several reasons. Table 1. Seeds from the rye cultivar BRS Serrano were sown in black polyethylene pots with a capacity of 14 liters that were filled with topsoil on May 25, The tool is available free of charge from R.
On each collection date, the plants were clipped close to the ground and manually separated into component organs roots, leaves, culms and inflorescencesand each fraction was separately placed in brown paper envelopes. Inputs The input matrix is arranged in the usual statistical format, i.
The maximum values of Fa were achieved on 28 DAE with a subsequent systematic decrease until the end of the plant development cycle, as the plants that were maintained at field capacity and the plants that were exposed to soil waterlogging showed maximum similarity on the Fa; however, the rye plants that were under the effect of two soil waterloggings exhibited a superior performance.
Plant growth analysis ppt
The RGR of trees in particular decreases with increasing size due in part to the large allocation to structural material in the trunk required to hold the leaves up in the canopy. The relative growth rate Rw demonstrated that all the plants, regardless of treatment differences, reached the highest increments of dry matter at 14 DAE, showing a systematic reduction after this point until the final stages of the rye cycle Fig. The treatments involved different waterlogging periods: a no waterlogging; b single waterlogging of three days; and c two soil waterlogging periods of three days. Another solution is to perform the analysis of variance for each harvest separately, though losing much information about the variations of the treatments over time, besides turning the analysis less sensible owing to the consequent decreased error degrees of freedom. Four pearl millet Pennisetum glaucum L. As the statistical comparison of the growth rates presents strong difficulties, both for the classical and functional approaches, the analysis of variance of the primary data could identify differences in the treatments under investigation, guiding the interpretation of the results. The dry matter production rates Ct were initially low and explained the reduced initial growth, as shown by Wf Fig. The analysis of variance imposes restrictions to experimental design thereby eliminating some advantages of the functional growth analysis. However, the plants that were under the action of a single period of soil waterlogging reached the highest accumulation of dry matter at DAE and remained superior compared to those that were exposed to two periods of soil waterlogging. From Causton and Venus , eqn 2.
The relative growth rate tends to be higher at the beginning of plant development due to the leaf area being composed of young leaves with a high photosynthetic capacity and high growth rate. Not all of these variables are essential see below. In this journal alone, Hoffmann and Poorter reported that 28 articles since have drawn upon the approach in one way or another.
A second Ea peak was established at 98 DAE when the plants that were grown at field capacity reached higher Ea values compared to those that were under a single waterlogging. Two main approaches have been used toward estimating growth rates: in the classical approach, mean values of growth rates are calculated by formulae previously derived, using data of two consecutive harvests, whereas in the functional approach, mathematical functions are fitted throughout the growth data over time, their differentiation providing instantaneous values of growth rates.
Plant growth curve analysis
The other calculated indices included the harvest index and relative seedling emergence rate originating from the seeds of plants that were maintained at field capacity and under the effect of soil waterlogging. Most of the Ea is due to the increase in the leaf area Fig. Seeds from the rye cultivar BRS Serrano were sown in black polyethylene pots with a capacity of 14 liters that were filled with topsoil on May 25, However, the plants that were under the action of a single period of soil waterlogging reached the highest accumulation of dry matter at DAE and remained superior compared to those that were exposed to two periods of soil waterlogging. It uses simple primary data in the form of weights, areas, volumes and contents of plant components to investigate processes within and involving the whole plant Evans, ; Causton and Venus, ; Hunt, The harvest index Hi and the seedling emergence E were superior in the plants that were maintained under field capacity or subjected to one soil waterlogging compared to the plants that were subjected to two waterloggings Tab. The trays were maintained at field capacity according to the methodology described elsewhere.
The plants were collected at regular intervals of 14 days after emergence until the end of the growth cycle, measuring the dry matter accumulation and the leaf area for growth analysis and dry matter partition between the organs and number of flowers.
At each harvest, leaf area and root area were measured. The analysis of variance imposes restrictions to experimental design thereby eliminating some advantages of the functional growth analysis.
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