Abstract
Improved plant growth model under the competition between the plant and weed was tried to develop in order to expect the maximum plant yield with the minimum labor.Following differential equation was formularized as the plant growth model which describes basically logistic curve.dy/dt={M-a·y+f(y)}y{1-ho(y)/r·g(t)/go(t)}where, y: the weight of the plantt: time from the plantingM/a: estimated maximum growth weight, yef(y): collection term of quadratic equation of y approximated by the expression of b (y-c) (y-d)ho(y): the inhibition function of the weed approximated by the expression of u(y-v)(y-ye)r: the relative growth rate, M-a·y+f(y)g(t): the weight of the weed approximated by the expression of A·tBgo(t): the weight of the weed at non-weeding treatment plot approximated by the expression of Ao·tBOVarious optimum parameter values were obtained from the estimated plant growth values decided on the growth data of chinese cabbage cultivated in fall, 1979 to input in to the plant growth model equation and caluculate by the electronic computer using the solusion of the Runge-Kutta method for evaluating the numerical values of differential equation.The caluculated value of the each weeding treatment plot agreed well with the estimated value of it, however, measured value of the mechanical weeding treatment plot was rather smaller than the caluculated value of it. This is caused by the existance of a lot of plant-spacing weed which was not able to be removed by the machine and inhibited the plant growth more seriously. a lot of plant-spacing weed which was not able to be removed by the machine and inhibited the plant growth more seriously.The growth rate of each weeding treatment plot described mountaineous curves which had maximum values at the point of about 60th day after the planting, and then there were scarecely difference of the two between the three-time weeding treatments and the four-time treatments by the machine.The acceleration of the plant growth which is obtained from the differential calculus of the plant growth rate was larger at about 35th to 55th day after the planting. Therefore, the precision weeding treatment at this time may bring the increase effect of the plant yield.The opimum weeding operation system in this case was as follows;21th day after the planting-mechanical35th day after the planting-manual49th day after the planting-mechanicalwhich brings 5610gf/0.6m2 of the plant yield. This is more than 99 percent of 5650gf/0.6m2 of the plant yield estimated from non-weed-four-time manual weeding treatment plot and 25 percent increase of 4460 gf/0.6m2 of the plant yield estimated from non-weeding treatment plot. It is author's conclusion that this plant growth model discussed here is the effective method to estimate the suitable weeding time and optimum weeding mean as the objective function of the maximum plant yield, and ultimately contributes to the improvement of weeding operation.
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Claims 11
Claim · model-written summary
The calculated growth of each weeding treatment plot agreed well with the estimated value.
- Taxon
- chinese cabbage
Brassica rapa subsp. pekinensist0 - Outcome
- caluculated valuee2
- Direction
- agreed welle2
- Comparator
- estimated valuee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e2“The caluculated value of the each weeding treatment plot agreed well with the estimated value of it”
Claim · model-written summary
Measured yield of the mechanical weeding plot was rather smaller than the calculated value.
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Treatment
- mechanical weeding treatmente3
- Outcome
- measured valuee3
- Direction
- smallere3
- Comparator
- caluculated valuee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e3“measured value of the mechanical weeding treatment plot was rather smaller than the caluculated value of it”
Claim · model-written summary
Plant-spacing weeds that the machine could not remove inhibited cabbage growth more seriously, which the authors give as the cause of the smaller measured value.
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Interactor
- plant-spacing weede4weed
- Outcome
- plant growthe4
- Qualifier
- not able to be removed by the machinee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e4“This is caused by the existance of a lot of plant-spacing weed which was not able to be removed by the machine and inhibited the plant growth more seriously”
Claim · model-written summary
The growth rate of each weeding treatment plot had maximum values at about the 60th day after planting.
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Outcome
- growth ratee5
- Direction
- maximum valuese5
- Qualifier
- at the point of about 60th day after the plantinge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e5“The growth rate of each weeding treatment plot described mountaineous curves which had maximum values at the point of about 60th day after the planting”
Claim · model-written summary
Growth rate showed scarcely any difference between the three-time and four-time machine weeding treatments.
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Treatment
- three-time weeding treatmentse6
- Outcome
- growth ratee5
- Direction
- scarecely differencee6
- Comparator
- four-time treatments by the machinee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e6“there were scarecely difference of the two between the three-time weeding treatments and the four-time treatments by the machine”
e5“The growth rate of each weeding treatment plot described mountaineous curves which had maximum values at the point of about 60th day after the planting”
Claim · model-written summary
The acceleration of plant growth was larger at about 35 to 55 days after planting.
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Outcome
- acceleration of the plant growthe7
- Direction
- largere7
- Qualifier
- at about 35th to 55th day after the plantinge7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e7“The acceleration of the plant growth which is obtained from the differential calculus of the plant growth rate was larger at about 35th to 55th day after the planting”
Claim · model-written summary
Precision weeding at this time may increase cabbage yield.
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Treatment
- precision weeding treatment at this timee1
- Outcome
- increase effect of the plant yielde1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e1“Therefore, the precision weeding treatment at this time may bring the increase effect of the plant yield”
Claim · model-written summary
The optimum weeding system (mechanical at day 21, manual at day 35, mechanical at day 49) gives a simulated yield of 5610 gf/0.6 m2.
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Treatment
- 21th day after the planting-mechanical35th day after the planting-manual49th day after the planting-mechanicale1
- Outcome
- plant yielde2
- Direction
- increaseinferrede2
- Value
- 5610gf/0.6m2e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e1“21th day after the planting-mechanical35th day after the planting-manual49th day after the planting-mechanical”
e2“which brings 5610gf/0.6m2 of the plant yield”
Claim · model-written summary
The optimum weeding system gives a simulated yield that is more than 99 percent of the four-time manual weeding plot (5650 gf/0.6 m2).
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Treatment
- 21th day after the planting-mechanical35th day after the planting-manual49th day after the planting-mechanicale1
- Outcome
- plant yielde2
- Direction
- more thane2
- Value
- more than 99 percente2
- Comparator
- non-weed-four-time manual weeding treatment plote2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e1“21th day after the planting-mechanical35th day after the planting-manual49th day after the planting-mechanical”
e2“This is more than 99 percent of 5650gf/0.6m2 of the plant yield estimated from non-weed-four-time manual weeding treatment plot”
Claim · model-written summary
The optimum weeding system gives a simulated yield 25 percent above the non-weeding plot (4460 gf/0.6 m2).
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Treatment
- 21th day after the planting-mechanical35th day after the planting-manual49th day after the planting-mechanicale1
- Outcome
- plant yielde2
- Direction
- increasee2
- Value
- 25 percente2
- Qualifier
- 4460 gf/0.6m2 of the plant yielde2
- Comparator
- non-weeding treatment plote2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e1“21th day after the planting-mechanical35th day after the planting-manual49th day after the planting-mechanical”
e2“25 percent increase of 4460 gf/0.6m2 of the plant yield estimated from non-weeding treatment plot”
Claim · model-written summary
The authors conclude that the growth model is an effective method to estimate suitable weeding time and optimum weeding means for maximum yield.
- Taxon
- chinese cabbageBrassica rapa subsp. pekinensist0
- Outcome
- estimate the suitable weeding time and optimum weeding meane1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“autumn-sown chinese cabbage”
e1“It is author's conclusion that this plant growth model discussed here is the effective method to estimate the suitable weeding time and optimum weeding mean as the objective function of the maximum plant yield”
The same questions in other papers
herbicide · growth · Brassica rapa (field mustard)Results agree
2 papers in the same direction as this paper
- no effect
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.