Evaluation of calcium sulphate, potassium silicate and moringa dry leaf powder on Meloidogyne incognita infecting tomato plant with reference to N, P, K, total phenol and cholorophyl status under greenhouse condition

摘要

A pot randomized complete block design experiment was carried-out to evaluate the impact of calcium sulphate or potassium silicate or moringa dry-leaf powder either alone or combined as double or triple treatments along with oxamyl or the three items + oxamyl 24% L as tetra application in comparison with oxamyl at the recommended dose against Meloidogyne incognita infecting tomato plant cv. 9065 FI under greenhouse conditions (25±3°C). All tested treatments improved plant growth criteria and reduced nematode parameters as well. Moringa dry leaf powder singly surpassed other tested single treatments? in the increment values of total plant length, number of leaves and branches per plant; total plant fresh weight and shoot dry weight, and also accomplished the highest percentage reduction of nematode parameters with the maximum values of final nematode population, number of galls and egg mass/plant, respectively. Among the dual treatments, moringa dry leaf powder plus calcium sulphate at their half doses overwhelmed other double treatments in the percentage increase values of such plant growth? characters of tomato and achieved the highest reduction values of final nematode population, number of galls and egg masses. Likewise, the same trend was evident as the two compounds of moringa dry leaf powder plus calcium sulphate mixed with oxamyl at 1∕3 each. Moreover, a similar trend was also strongly observed in the case of applying oxamyl to that tested three components as 1∕4 each which gave the high synergistic action by showing the highest recorded values of plant growth criteria and also recorded a high synergistic action in diminishing nematode criteria as well as the highest percentage increase value of total phenol (23.70%). The C/N ratio of the tetra treatment gave the least value of this item (16.03:1), while oxamyl had 19.67:1 vs. 22.88:1 for nematode alone, respectively.