Herbicidal Activity of IIA-IIE

As a preliminary bioassay, some alkali metal salts of (9-aIkyl 1-(substituted phenoxyacetoxy)aUtylphosphonic acids IIA-IIE were tested for herbicidal activity on barnyard grass (Echinochloa crusgalli) and cabbage type rape (Brassica napus) by the Petri dish method. For further herbicidal activity evaluation, most of 

Symmetry transformations used to generate equivalent atoms -x + 2, -y + 2, -z + 1 

I Herbicidal Activity of Lithium 6 -Alkyl I-(2,4-Dichlorophenoxyacetoxy)Alkylphosphonates IIA 

As shown in Table 3.9, most IIA showed moderate-to-weak post-emergence herbicidal activity against dicotyledonous rape, common amaranth and clover. Among these compounds, IIA-8 and IIA-I6 (R=Me or Et, R =4-MePh) displayed significant post-emergence herbicidal activity ( 90 %) against all tested dicotyledons, including rape, common amaranth and clover at 1.5 kg ai/ha. 

All tested IIB in Table 3.12, showed higher post-emergence activity against dicotyledons than monocotyledons. 

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