Evaluation of the allelopathic potential of four sweet potato [Ipomoea batatas (L.) Lam.] varieties on sprouting and early seedling growth of purple nutsedge (Cyperus rotundus L.)

Date

4-2012

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Baltazar, . Aurora M

Abstract

Laboratory and pot experiment were conducted to evaluate the allelopathic potential of four sweet potato varieties, namely, UPL Sp - 5, PSB SP - 21, NSIC Sp - 24 and NSIC Sp - 31sweet potato [Ipomoea batatas (L.) Lam.] on sprouting and early growth of purple nutsedge (Cyperus rotundus L.). Water extracts from the root periderm and shoot (stem + leaves) were used. Bound residue or the solid extract, 50 % concentrate and 100% concentrate liquid extracts were obtained from each plant part of the four sweet potato varieties and were tested for their effects on sprouting and on shoot and root length of tubers in laboratory (Petri dish) study. In the pot study, the same extract concentrations were tested for their effects on plant height and number of leaves of purple nutsedge seedlings. Seedlings treated with glyphosate (N – (phosphonomethyl) glycine) and 2, 4 – D (2, 4 –dichlorophenoxy acetic acid) were also included as standard controls. The UPL Sp - 5 and PSB Sp - 21 sweet potato varieties were observed as the most effective in inhibiting sprouting and root and shoot growth of purple nutsedge tubers at 7 days after treatment (DAT). Tubers treated with NSIC Sp - 31 root periderm extract also showed root growth inhibition at 7 DAT. Shoot liquid concentrate and bound residue of PSB Sp - 21 and the bound residue of NSIC Sp - 31 root periderm extract suppressed the height of purple nutsedge, indicating probable allelopathic activity of these varieties against the purple nutsedge. Leaf discoloration such as browning and whitening of seedlings treated with UPL Sp - 5 and PSB Sp – 21 extracts were observed at 7 and 13 DAT. Glyphosate and 2, 4 - D provided excellent control and death of purple nutsedge plants, and were the most effective in controlling purple nutsedge, compared with the sweet potato extracts.

Language

English

Call Number

LG 993.5 2012 A42 P86

Document Type

Thesis

This document is currently not available here.

Share

COinS