LEAF MORPHOLOGICAL GROWTH OF SUNFLOWER IN RESPONSE TO TYPE AND FRACTION OF IRRIGATION WATER
DOI:
https://doi.org/10.31413/nat.v13i1.18063
Keywords:
Helianthus annuus L., magnetized water, water replacement, leaf growthAbstract
The leaf surface is the most important structure of the sunflower. The objective of this study was to evaluate the morphological changes in the leaves when the sunflower was subjected to variable irrigation combined with a magnetic field. The study was conducted in a protected environment and the experimental design was randomized blocks, organized in a 4 x 2 factorial arrangement with 4 replications, whit 4 water replacements (100, 75, 50 and 25% - RH) and 2 types of irrigation water (normal and magnetized). Evaluated the average relative growth rate ( ), net assimilation rate ( ), specific leaf area (SA), leaf area index (L) and leaf area duration (DA) were evaluated. Reductions were observed in all the characteristics evaluated, due to the lower water availability caused by the increase in electrical conductivity. The highest amount of magnetized RH than normal RH is required to obtain highest ( ). Highest RH results in high ( ), up to the maximum L limits of 7.8 (normal water) and 9.0 (magnetized water). There was an inverse relationship between ( ) ̅ and L due to self-shading and reduced photosynthetic efficiency of senescent leaves. SA showed a linear relationship with RH and DA reached a peak at 17 days with RH of 88.30 %.
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