scholarly journals Studies on the Dry Matter Production of Sweet Potato : VII. Varietal differences of photosynthesis and factors concerning with photosynthetic rate.

1964 ◽  
Vol 32 (4) ◽  
pp. 315-318
Author(s):  
Yukindo TSUNO ◽  
Kazuma FUJISE
Keyword(s):  
Sweet Potato ◽  
Photosynthetic Rate ◽  
Dry Matter ◽  
Dry Matter Production ◽  
Varietal Differences ◽  
Matter Production

scholarly journals Photosynthesis rate, chlorophyll content and initial development of physic nut without micronutrient fertilization

2013 ◽  
Vol 37 (5) ◽  
pp. 1334-1342 ◽  
Author(s):  
Elcio Ferreira dos Santos ◽  
Bruno José Zanchim ◽  
Aline Grella de Campos ◽  
Raphael Florencio Garrone ◽  
José Lavres Junior
Keyword(s):  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Dry Matter ◽  
Complete Solution ◽  
Physiological Responses ◽  
Dry Matter Production ◽  
Physic Nut ◽  
Initial Development ◽  
Cu Deficiency ◽  
Matter Production

Few studies in Brazil have addressed the need for micronutrients of physic nut focusing on physiological responses, especially in terms of photosynthesis. The objective of this study was to evaluate the effects of omission of boron (B), copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) on Jatropha curcas L.. The experimental design was a randomized block with four replications. The treatments were complete solution (control) and solution without B, Cu, Fe, Mn, and Zn. We evaluated the chlorophyll content (SPAD units), photosynthetic rate, dry matter production and accumulation of micronutrients in plants, resulting from different treatments. The first signs of deficiency were observed for Fe and B, followed by Mn and Zn, while no symptoms were observed for Cu deficiency. The micronutrient omission reduced the dry matter yield, chlorophyll content and photosynthetic rate of the plants differently for each omitted nutrient. It was, however, the omission of Fe that most affected the development of this species in all parameters evaluated. The treatments negatively affected the chlorophyll content, evaluated in SPAD units, and the photosynthetic rate, except for the omission of B. However this result was probably due to the concentration effect, since there was a significant reduction in the dry matter production of B-deficient plants.

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