EFFECT OF HUMIC ACID SPRAY ON SOME VEGETATIVE TRAITS, PHYSIOLOGICAL AND ANATOMICAL LOCAL LEAF LETTUCE (Lactuca sativa L.)

Abstract

This study was conducted on lettuce(Lactuca sativa L.) local cultivar for the period from 10/12/2008 to the end of January of 2009, in one area of agricultural fields Al Jazeera/Abu-Thiab in the city of Ramadi, to determine the effect of fertilizer with humic acid on some qualities vegetative growth parameters and some chemical and anatomical characteristics of leaf lettuce, The study included four concentrations of humic acid (0 , 0.25 , 0.50 , 1 g/L), with adding four foliar in 15 day and four sprayed for the duration ofthe experiment The design used Complete Randomized Block Design, with three replicates for the treatment of plant by 35 experimental unit, The study showed the following results : The results showed that spraying with humic acid had a significant effect on most studied traits treatment comparison, Treatment H4 showed significant superiority on all other treatments which gave the highest rate in the proportion of edible leaves and content its of chlorophyll (a and b). and larger showing of the bottom epidermis cells and amounted values 67.60 % and (0.4133 , 0.8133 mg/g) and 54.70 Mm relay, They also showed treatment with humic acid three concentrations significant superiority comparison treatment in head the vicinity and percentage of nitrogen, potassium and carbohydrates, while recorded a treatments H3 and H4 significant increase in height of the head and rate the degree of introverted plant leaves and percentage of phosphorus and rate width of cells in upper epidermis of party to paper free, also recorded a treatments H2 and H4 significant increase in the rate of leaf area and the largest length of the cells reached (201 and 199 cm2) and (171.00 and 102 Mm) Respectively, And characterized the transaction H4 significant increase to the weight of the head hit 1.138 kg Compared with H1(0.770 kg) But did not reach the degree of moral.