The life cycle of maize can be divided into three stages: seedling stage, booting stage and grain stage. Each stage has different requirements for nutrients. This differential demand stems from the intrinsic laws of corn growth. 
The growth of vegetative organs such as roots, stems, and leaves is mainly carried out at the seedling stage, and nitrogen fertilizer is the most dependent. Nitrogen promotes chlorophyll synthesis and accelerates photosynthesis, and is the main element that makes up proteins, which directly affects the vigorous growth of plants. Nutrients such as phosphorus and potassium only play an auxiliary role. At booting stage, the plant enters the transition stage and needs a large amount of phosphorus to support panicle formation. Finally, potassium becomes the first required nutrient at the flowering and fruiting stage and seed enrichment stage at the flowering and fruiting stage, which can improve the grain quality. 
Therefore, the specific requirements for the main nutrients in each stage are the needs of the normal growth of the plants. If this is confused or ignored, changing the normal ratio of the three nutrients will affect the structural development and weaken the yield. This explains why it is important to understand the nutritional differences at different times and adjust fertilization accordingly in order to achieve the best harvest of maize. Maize growth in the late growth period has been shown to be a double blow to both yield and quality. On the one hand, the vigorous growth of branches and leaves caused by the excessive use of nitrogen fertilizer will inhibit the reproductive growth of maize, and a large number of nutrients will be allocated to vegetative growth, resulting in insufficient accumulation and storage of grains, which will directly lead to the reduction of yield per mu. 
Statistics show that the average yield per mu of Wangchang plot is 8%-15% lower than that of the control plot. On the other hand, the overgrowth of stems and leaves increases the mechanical load of the plant itself, and in the middle and late stages, once it encounters strong winds and heavy rains, it is easy to lodging as a whole, which affects the normal nutrient transport of grains, reduces the fullness, and may lead to the death of the whole piece in severe cases. It can be seen that Wangchang seriously hinders the realization of high yield and high quality. The root cause is that the best time to control the prosperity is missed, and the irrational use of nitrogen fertilizer leads to a large amount of nitrogen accumulation and inhibits the activity of reproductive enzymes. To reverse this situation, it is necessary to strictly control the vigor from the booting stage of maize, gradually weaken the vegetative growth, and completely transition to the reproductive state, which is necessary to ensure a bumper harvest. 
Regarding the best window period for corn control, experts have given clear suggestions after years of test and comparison - from the end of the seedling stage, that is, when the corn plant enters the booting stage, when there is a large bell omen, it will be controlled and controlled to the end of heading and flowering. At this time, although the plant is still growing vigorously on the surface, the physiological transformation behind it has begun, and the core nutrient demand is changing, entering a transition period, which is the best time to stop the boom. 
It is too late to postpone until the flowering period to control the vigor. Although it seems that it has begun to "age" during this period, the strong supply of nutrients such as nitrogen fertilizer will still cause the rise of vegetative growth and inhibit reproduction, which is irreversible. It is also not ideal to control the growth in the seedling stage in advance, which will affect the construction of basic vegetative organs, weaken the resistance, and is not conducive to the vigorous growth in the later stage. Therefore, according to the growth characteristics of maize, the booting stage is the best period for peak control that can neither be postponed nor advanced, and it is the best in terms of overall survival rate and drug efficacy durability. Grasping the correct peak control time is the embodiment of precision agriculture and the cornerstone of stable and high yield. This is universally recognized. 
1) Controlling the use of nitrogen fertilizer is the most direct and effective measure. Since nitrogen is the main element that makes up proteins and is the basis of all life activities, it is easy to lead to excessive prosperity. Therefore, for the plots showing signs of vigorous growth, the addition of nitrogen fertilizer can be stopped after the booting stage, and only the basal amount can be guaranteed, and the application ratio of phosphorus and potassium ammonium can be strengthened instead. This can be achieved quickly, and the growth momentum of the plant is obviously controlled within 2-3 days, and it is also more economical and practical. However, only if the basic level of nitrogen fertilizer is not high, plots with strong soil fertility may still flourish. 
2) Controlling soil moisture and regulating soil moisture is also a feasible passive regulation method. If the water demand can be met by natural rainfall, artificial irrigation will be stopped. This forces the plant to maintain the xylem water supply by slowing down water loss, thus inhibiting the vegetative growth of the spray. In the same way, for dryland corn, a reasonable increase or decrease of one watering can also have the effect of controlling prosperity. This method is simple and direct, but it depends on the time of day, and cannot accurately control the degree of control, so it is only recommended to use it as an aid. 
3) Foliar spraying of phosphorus and potassium is the ideal active control method is to carry out foliar spray of potassium dihydrogen phosphate from the large flare to heading, or the top dressing of phosphorus and potassium fertilizer in the plots with obvious vigor. This can be done by supplementing the second and third restricted nutrients, adjusting the proportion of each nutrient, and guiding the plant to enter the reproductive stage, which can achieve rapid results. The magnitude of regulation can be accurately controlled by mixing different types of phosphorus and potassium fertilizers. This method is more expensive to invest in, but it can be used selectively according to the actual situation. 
4) The last method of using growth regulators is to spray growth regulators such as paclobutrazol, brassinin ester, etc., and spray stems and leaves at the end of tillering. These agents can inhibit growth hormone at the physiological level and slow down the growth rate. The concentration and period must be strictly controlled when used, but the effect is significant. The cost is also high, and it is usually used in combination with phosphorus and potassium fertilizers, which can accurately control the prosperity and optimize the investment. The emergence of compound growth regulators also provides more possibilities for this kind of growth control method. Through the analysis of the necessity and method of maize growth control, we can see that the core purpose of this measure is only one, that is, to stabilize the growth potential of plants during the critical growth period, avoid excessive nitrogen accumulation, inhibit reproductive enzymes and promote excessive growth, so as to ensure light stem force, full grains, and achieve high yield and high quality. 
In short, it can be regarded as guiding plants to switch to the right growth rhythm at the right time, regulating the precision of metabolism, reasonably distributing limited nutrients to important links such as seed enrichment, and improving resource utilization efficiency. On the one hand, it satisfies the economic goal of high yield and high efficiency, and at the same time, it also makes the yield and germplasm improvement go hand in hand, and truly realizes the harmony and unity of ecological economy. Therefore, corn control is an indispensable part, connecting the previous and the next, connecting basic breeding, optimization of nutritional conditions and harvest goals, which can be said to be of far-reaching significance. Correctly carrying out prosperity control is the only way to a bumper harvest.
A town in Handan, Hebei Province, will have a corn planting area of 8,000 mu in 2022. Over the years, the town's corn production has been in the middle and lower reaches. In 2022, the town took measures to control prosperity in the main corn producing areas, specifically: 2,000 acres of pilot plots in the production area were selected, and at the end of the big flare period on June 25, the ground application of phosphorus and potassium mixed fertilizers was carried out, and at the same time, foliar spraying was carried out with aqueous solution of growth regulator. In addition, the number of times the plot is irrigated is controlled. The rest of the plots were managed according to the original fertilization scheme and watering mode.
Through the comparative experiment, it was found that there was a significant difference in the growth status of plants between the pilot plot and the control plot from the heading stage. The control plots continued to maintain a vigorous growth momentum, while the growth rate of the pilot plots slowed down significantly, the stems were refined, and the breeding goal was lightweight. In the end, the average yield per mu of the pilot plot was 557 kg, while that of the control plot was only 522 kg, and the yield per mu increased by 35 kg, and the yield increase ratio reached 6. 7%。Combined with economic analysis, this has also increased the per capita income of the pilot plot by more than 10%.
It can be seen that precise control of prosperity can effectively curb overgrowth, strengthen reproductive efficiency, and significantly improve yield and economy, which is an important measure worth promoting. In the later stage, we can continue to expand the scale of the pilot, or formulate differentiated prosperity control strategies for different varieties and fertility conditions. Although peak control is particularly important for high yields, there are still a few precautions in the operation process: First, the measures must be customized according to the characteristics of the variety. There are differences in the sensitivity of different genotypes to the environment, and the response to peak control is also different. Appropriate methods and control intensities should be selected to prevent over-control from affecting yield.
Second, soil fertility should be considered in the selection of control methods. For example, in fertile soils, nitrogen fertilizer alone may not be effective in controlling growth. In this case, a combination of means must be used. Third, the end of tillering must be mastered during the peak control period. Applying it early or late can significantly reduce effectiveness. This is determined by the law of change in the growth cycle of maize. Fourth, plant response must be monitored after regulation to avoid growth inhibition. Once growth arrest is found, shallow application of micronutrients should be supplemented in time.
In addition, attention should also be paid to the appropriate water supply after regulation and control, and strict field management. Only by meeting these conditions can we give full play to the effect of controlling prosperity and steadily increase the output value. The promotion and implementation of corn control can not only improve economic output, but also have a positive impact on the environment and society. First, Wangwang can reduce the amount of fertilizer input. Through scientific fertilization to improve the utilization rate, it not only reduces the cost but also reduces the risk of agricultural non-point source pollution, and achieves a win-win situation of economic and ecological benefits. Second, while controlling the prosperity can increase yields, it can reduce the new planting area. This helps to conserve land resources, avoid over-exploitation of fertile land, and maintain soil quality.
Third, the increase in unit output increases farmers' sense of gain, which helps to stabilize the enthusiasm of corn planting. This is an important foundation for the development of rural society. However, we should also note that the implementation of Wangwang requires more technical and labor costs. This can also be difficult for smaller growers. Therefore, in the process of community promotion, it is necessary to strengthen technical guidance and support to ensure that planting subjects of different sizes can benefit from it. In order to more fully illustrate the effect of maize control and growth, the relevant data support is summarized as follows: 1. According to the research report of the Chinese Academy of Agricultural Sciences, in the comparative experiment, the average yield per mu of the treatment plot with the control measures was increased by 5 compared with the control plot with normal fertilization. 2%-8。1%。This fully verifies the direct economic value of Kongwang.
2. Environmental monitoring data show that compared with the traditional planting mode that often has vigorous growth, the total nitrogen loss during the planting period of the fields with vigorous growth control is reduced on average5. 3 kg mu, which can significantly reduce the risk of non-point source pollution. 3. According to the survey of local agricultural technicians, 85% of corn farmers are satisfied with the effect of the development of prosperity control technology. 74% of the rural households expressed their willingness to promote the application of prosperity control measures. This reflects the social effect of Kongwang in enhancing farmers' sense of gain and interest in planting. 4. The increase in unit output also makes the wangwang control technology show good economic value. Based on the calculation of 500 yuan of corn market**, for every 1% increase in yield, the planting income can increase by about 25 yuan mu.
To sum up, the Wangwang technology not only has remarkable effects, but also has multiple social, economic and environmental benefits. It is fully proved that this is a scientific cultivation measure suitable for high yield and high efficiency of maize, which is worthy of further promotion and reference. Through the above comprehensive analysis, we can see that corn control is an important part of achieving high yield and high efficiency. Taking scientific regulation and control measures in the critical period of maize growth can not only effectively curb the unreasonable growth phenomenon, ensure the reasonable allocation of nutrients to the accumulation of grain nutrients, and directly improve the yield level, but also reduce the waste of resources and reduce the pressure on the ecological environment.
Looking ahead, we also need to continue to optimize the technical solutions for peak control, and formulate differentiated and precise control strategies based on the characteristics of high-yielding new varieties and a variety of environmental conditions, so that more growers can easily adopt them. On the other hand, it is particularly important to strengthen the analysis of the physiological mechanism of wang control, which will help us develop a more scientific, economical and practical new technology system for wang control. We firmly believe that under the guidance of scientific and technological progress, the theory and practice of corn control technology will continue to deepen, and the driving effect on high corn yield will continue to be demonstrated.