water and fertilizer in sunflower crop planting

Talking about the application of water and fertilizer in sunflower crop planting
We need to help users understand the water-fertilizer formula and integrated field water-fertilizer solution for sunflower cultivation. First, there are several key points: water-fertilizer formula, integrated field water-fertilizer solution, fertilizer application based on growth conditions, and fertilizer application based on nutritional needs. Next, we need to search for water-fertilizer formulas for different growth stages. For example, there may be different formulas for the seedling stage, flowering stage, and maturity stage.

In addition, adjust fertilizer use according to growth conditions and nutritional needs. This may involve soil testing, leaf analysis, and other methods, so you need to search for how to monitor and adjust water and fertilizer according to growth conditions, and how to fertilize according to nutritional needs (such as nitrogen, phosphorus, and potassium ratios).

The sunflower's growth stages and characteristics are as follows: The sunflower's growth cycle can be divided into five stages: emergence (from sowing to seedling emergence), seedling stage (from seedling emergence to bud formation), bud stage (from bud formation to initial flowering), flowering (from initial flowering to final flowering), and fruiting stage (from final flowering to maturity). The vegetative growth stage is from germination to bud formation, while the reproductive growth stage is from bud formation to maturity.
The paper mentions that sunflowers have four main growth stages: emergence, budding, flowering, and maturity. The paper emphasizes the water and nutrient requirements of different growth stages. For example, the period from budding to flowering requires high water requirements, necessitating increased water and fertilization. A mathematical model was used to analyze the growth dynamics of sunflower seedlings in trays, dividing the growth process into gradual, rapid, and slow growth stages. The rapid growth stage was identified as the most critical period for seedling growth.
The water and fertilizer management standards corresponding to each growth stage of sunflower are mainly reflected in the fertilizer requirements, water requirements, and fertilization time and method at different growth stages. The following is an analysis based on the information I searched:

Sunflowers have varying water and fertilizer requirements at different growth stages. For example, the disc differentiation period (such as floret and pistil differentiation) is a critical period for yield development. Fertilizing and watering during this period can effectively promote disc development and seed production. Furthermore, the period from bud formation to flowering is a period of vigorous vegetative and reproductive growth, requiring primarily nitrogen fertilizer. Topdressing should primarily be nitrogen fertilizer, which can be applied in furrows or holes.

Sunflowers require a large amount of fertilizer, requiring nitrogen, phosphorus, and potassium throughout their growth period. Nitrogen fertilizer is required more during disc formation and flowering, phosphorus fertilizer is required more during seedling emergence and disc formation, and potassium fertilizer is required most during disc formation and wax maturity.
Sunflowers are sensitive to moisture, requiring varying amounts of water at different stages of their growth. Water deficiency or over-wetness during the seedling stage can both affect growth. The ideal soil moisture content is 55%-70% during the early growth phase, and 70%-90% from inflorescence formation to one week after flowering. In salinized soils, appropriate irrigation and fertilization can alleviate salt stress and increase yield.
Water and fertilizer regulation significantly impacts sunflower growth, yield, and water use efficiency. Research has shown that in moderately saline soils, appropriately reducing irrigation and fertilization (e.g., reducing irrigation quotas by 20% and fertilizer application by 20%) can improve photosynthetic efficiency and yield.

In saline irrigation areas, brackish water irrigation and water-saving and salt-control techniques can improve sunflower quality and yield.
Sunflowers require a lot of fertilizer. To produce 100 kg of seeds, they need 4.4 to 7.44 kg of pure nitrogen, 1.33 to 1.86 kg of phosphorus pentoxide, and 14.60 to 16.6 kg of potassium oxide.

The application of integrated water and fertilizer technology in sunflower cultivation is primarily reflected in the following aspects: Application of integrated water and fertilizer technology: Integrated water and fertilizer technology uses intelligent control systems and IoT technology to achieve precise regulation of water and fertilizer, improving water and fertilizer utilization. For example, the design of an integrated water and fertilizer control system based on ESP32 enables remote control and data collection, improving the intelligence of water and fertilizer management. Furthermore, integrated water and fertilizer technology has also shown significant yield-increasing effects in oilseed sunflower cultivation. Through mechanized sowing and fertilization management, it improves seedling emergence rate and yield.
The impact of integrated fertigation on crop growth and yield: Research has shown that integrated fertigation can significantly improve sunflower growth and yield. For example, sub-mulch drip irrigation combined with integrated fertigation can increase dry matter accumulation and yield in sunflowers. Furthermore, integrated fertigation can effectively control Orobancha edible sunflower and improve sunflower resistance to pests and diseases.
Implementation Methods of Integrated Water and Fertilizer Technology: Integrated water and fertilizer technology typically combines irrigation methods such as drip irrigation and sub-membrane drip irrigation with intelligent control systems to achieve precise regulation of water and fertilizer. For example, a straw reactor combined with micro-drip irrigation integrated water and fertilizer system uses a controllable pipeline system to supply water and fertilizer, achieving a timed and quantitative supply of water and fertilizer. Furthermore, integrated water and fertilizer technology incorporates big data and the Internet of Things to achieve precise irrigation and fertilization.
The dynamic changes in the nutritional requirements of sunflowers at different growth stages are a complex process involving many factors such as water, nutrients (such as nitrogen, phosphorus, and potassium), water, light, and temperature. The following is an analysis based on the information I have searched:
Water Requirements: Sunflowers require varying amounts of water at different stages of growth, with lower water requirements in the early and late stages and greater water requirements in the middle stages, with higher water requirements in drought years. Water significantly impacts sunflower growth and yield. While sunflowers typically require less water, they still require ample water throughout their growth to ensure successful fruiting.
Nutrient Requirements: Sunflowers are fertilizer-intensive crops, requiring a variety of nutrients throughout their lifespan, with nitrogen, phosphorus, and potassium accounting for over 90% of these nutrients. The amounts and peak absorption periods of nitrogen, phosphorus, and potassium vary across different growth stages. For example, peak nitrogen absorption occurs from the budding to flowering stage, while peak phosphorus and potassium absorption occurs during the flowering or budding stage. Furthermore, sunflower nitrogen absorption is closely related to water content, with nitrogen levels influencing both water content and biomass.
Growth Stages and Nutritional Requirements: The sunflower's growth cycle can be divided into stages: emergence, seedling, bud, flowering, and fruiting. Nutrient requirements and growth rates vary across these stages. For example, while sunflower dry matter accumulation follows a logistic growth curve, organ balance (e.g., stem, leaf, and seed) and dry matter distribution vary across different growth stages.
Environmental factors: Soil salinization, salt stress, water stress and other environmental factors can affect the growth and nutrient absorption of sunflowers. For example, in salinized soils, the salt and ion distribution in the rhizosphere of sunflowers changes, affecting their growth.

Precision fertilization methods for sunflowers based on soil testing and foliar analysis primarily involve the following aspects: Soil testing and nutrient analysis: Soil testing can reveal the available nutrient content in the soil, thereby determining fertilizer rates and nutrient ratios based on different soil fertility levels. For example, research in Linhe District, through the "3414" fertilizer effect test and soil testing, determined the optimal fertilizer rate and base fertilizer/topdressing ratio for edible sunflowers. Furthermore, soil testing and fertilization techniques for sunflower cultivation in saline-alkali soils also emphasize the importance of soil testing for optimal fertilization.
Precision fertilization technology: Soil testing and formula fertilization techniques enable precise fertilization of sunflowers. For example, Yangyuan County, Hebei Province, through field trials of soil testing and formula fertilization, has developed a balanced fertilization technique suitable for local sunflowers. Furthermore, research has shown that appropriate fertilization can significantly increase dry matter accumulation and yield in sunflowers.
Nutrient absorption and fertilization effect: Studies have shown that sunflowers have different requirements for nutrients such as nitrogen, phosphorus, and potassium, and the fertilizer requirements vary in different growth stages. For example, more nitrogen is required from the formation of the disk to the flowering stage, while the most potassium is absorbed from the formation of the disk to the wax maturity stage. In addition, reasonable fertilization can improve the yield and quality of sunflowers. For example, the application of nitrogen fertilizer can significantly increase the yield, and the application of zinc fertilizer can also increase the yield. Trace elements and secondary elements: The application effect of trace elements (such as zinc, boron, and molybdenum) and secondary elements (such as sulfur) has also received attention to determine their application effect on sunflowers and the critical value of the soil.