Influence of the Suspension Fertilizers Lactofol and Some Herbicides on Green Beans and Peas.
II. Photosynthethic Activity and Plastid Pigments Contents

N. STOEVA1 and N. SHABAN2
1 Agricultural University, BG-4000 Plovdiv, Bulgaria
2 Forestry University, BG-1000 Sofia, Bulgaria

Abstract

STOEVA, N. and N. SHABAN, 2002. Influence of the suspension fertilizers Lactofol and some herbicides on green beans and peas. II. Photosynthethic activity and plastid pigments contents. Bulg. J. Agric. Sci., 8: 193–199

By means of field and laboratory experiments the antidote effect of the Lactofol (lactic acid salts, as special product under the brand name Lactofol® turned out to be a stable form of chelates) against the negative effects of herbicides Fuzilad and Bazagran on the beans and peas plants was studied. The herbicides Bazagran and Fuzilad have a specific negative effect on the leaf gas-exchange in the green beans and peas. A negative physiological aftereffect is observed in the young first-generation plants as well. The Lactofol, applied together with the herbicides Bazagran and Fuzilad, reduces this effect, and in most of the variants there occurs a stimulation of the processes. The different Lactofol forms, applied as anidotes of the herbicidal stress, cause a more stable gas-exchange – there occurs an activation of the photosynthesis, the transpiration, and the stomata conductance. No inhibition effect with respect to the contents of chlorophyll a and b in the green beans and peas leaves and the connected with it photosynthesis activity was recorded. The Lactofol O and Lactofol Fe forms are charcterized with the best physiological effect. The two crops are characterized with a different reaction.

Key words: beans and peas, Lactofol, herbicide antidote, leaf gas-exchange, plastid pigments