Soil seed bank weeds in cultivated area

Abstract

Experiment was conducted at the University of Sudan of Science and Technology, College of Agricultural Studies Department of Plant Protection Laboratory of Plant Pathology, -(shambat), in the period (April- 2016 m), to know the soil seed bank weed seeds of cultivated area. The samples were took from the demonstrated Farm in the College of Agricultural Studies, Sudan University for Science and Technology, The distances between samples were equal (10x10 meters) at a depth of (10 cm) and a diameter (8 cm), and the number of samples (25), and the weight of each sample, then mix the samples together and sieved in sieve (2) Mesh. The samples divided into (5) parts and the weed seeds extracted directly by washing with water in sieves graded diameters (0.2_2) mesh. The viability of the seeds was tested by compound calcium chloride. The results showed that the most common types of weeds sovereignty was Trianthema portulacastrum(35%), followed by Cynodon dactylon and Brachiaria deflexa(17.7%), followed by Ipomoea Cordofana(11.8%), Tribulus terrestris and Portulaca olearaceae(8.8%).