At present, in the field of insecticidal herbicides, the most hot category is phosphine glyphosate, phosphine glyphosate has become the second largest herbicide after glyphosate, in the past 10 years, the global compound annual growth rate of phosphine glyphosate has reached 12.2%.
Phosphine oxalate on the market at present is divided into two categories, one is called ordinary phosphine oxalate, because phosphine oxalate is an amino acid analogue, with D-phosphine oxalate and L-Phosphine oxalate 2 corresponding isomers, ordinary phosphine oxalate is a racemic mixture containing 2 isomers - D/ L-Phosphine oxalate, the general ratio is about 1:1.
Another class called fine oxalammonium phosphine, also known as L-oxalammonium phosphine, is through a complex process, eliminate D-oxalammonium phosphine, only retain L-oxalammonium phosphine, why do you want to do this? Because past theoretical studies believe that D-phosphine oxalate has no herbicidal activity, so eliminate half of the useless D-phosphine oxalate, only retain L-phosphine oxalate, then the same dose, it has double the herbicidal activity.
So is this really the case? Does D-glyphosate really have no herbicidal activity?
The answer is no. The results of some researches on the control of Martensium, vestrum, Amaranth and Abutilon showed that D-glyphosate showed a certain herbicidal activity, and the overall herbicidal activity of D-glyphosate was about 10% of L-glyphosate.
Plant Protection Research Institute of Jiangsu Academy of Agricultural Sciences published an experiment, which used 3 different structural 10% phosphine oxalate water agent (1#, 2# and 3#, 1# and 3# are common Phosphine oxalate, 2# are fine phosphine oxalate) to carry out laboratory basin tests on 7 target materials, including Matang, setaria, Barnyard grass, beef weed grass, duck plantar grass, amaranth and hollow-lotus grass. The herbicidal activities of common phosphine oxalate and refined phosphine oxalate were compared in order to provide a basis for clarifying the pharmacodynamic relationship between common phosphine oxalate and refined phosphine oxalate.
The test results show that:
(1) The three kinds of 10% phosphine oxalate water agent had 90% control effect on 5 ~ 6 kinds of target weeds, and the effect of common phosphine oxalate was not bad.
(2) At the same dose, the activity of fine phosphine oxalate was higher than that of ordinary phosphine oxalate, but there was no imagined disparity!
The ED90 values (i.e., the sensitivity of weeds to each agent from strong to weak) of the 2# agent against the 7 target weeds ranged from 60.55 to 628.55 mL/667 m2.
The ED90 values of common phosphine glyphosate (agent 1#) against seven target weeds ranged from 74.02 to 621.44 mL/667 m2, and the relationship between the multiple of agent 1# and agent 2# was 0.99 to 2.36 times that of agent 1#.
The ED90 values of phosphine glyphosate (3# agent) against 7 target weeds ranged from 33.76 to 753.58.44 mL/667 m2. The relation between the ED90 value of the 3# agent and the ED90 value of the 2# agent is 0.56 ~ 2.31 times of the ED90 value of the 3# agent.
(3) The dosage of 1# and 3# common phosphine oxalate was 1.37-1.47 times and 1.23-1.47 times of the dosage of 2# refined Phosphine oxalate, respectively, which was far less than the 1.8-2 times predicted previously.
Under the condition that the 3 different structural types of 10% phosphine oxalammonium water agent achieved 90% control effect on 5 ~ 6 kinds of target weeds, the dosage of 2# fine Phosphine oxalammonium was 300-380 mL/667 m2. The dosages of 1# and 3# common phosphine oxalate were 440-530 mL/667 m2 and 440-470 mL/667 m2, respectively.
Therefore, it is untenable to conclude that glyphosate can double the effect of weeding.
Tail sound
Since D-phosphine oxalate has partial herbicidal activity, and refined phosphine oxalate is based on ordinary phosphine oxalate, which has herbicidal activity of D-phosphine oxalate, it is also a waste of resources. Moreover, due to the complex production process and high cost of refined phosphine oxalate, the herbicidal effect of refined phosphine oxalate does not meet the expectations. The dosage of the two common phosphine oxalate agents in the test was only 1.37-1.47 times and 1.23-1.47 times of the dosage of Phosphine oxalate. According to this pharmacodynamic reasoning, the herbicidal effect of 200 g/l of common phosphine oxalate was better than 10% of phosphine oxalate. Compared with ordinary phosphine oxalate, refined phosphine oxalate did not achieve the expected doubling of efficacy.
Finyphosphine does not double the weeding effect, because D-Phosphine oxyphosphine also has the weeding effect!
2023 11/27