Soybean Irrigation

Thirsty Crops: Understanding the Importance of Soybean Irrigation

Water is life – this statement holds true not just for humans, but for crops as well. In the world of agriculture, particularly in soybean cultivation, irrigation plays a key role in determining the health and yield of the crops. Our blog post, “Thirsty Crops: Understanding the Importance of Soybean Irrigation,” aims to delve into this critical aspect of farming. We will explore the science behind irrigation, the techniques that maximize benefits, and the profound impact it has on the success of soybean cultivation. A well-irrigated soybean field is not just a thriving ecosystem, but a testament to the harmonious interplay of nature and technology. Join us as we dive into the world of soybean irrigation.

The Importance of Irrigation in Soybean Cultivation

Irrigation plays a crucial role in soybean cultivation, affecting not only the yield but also other characteristics of importance to growers, like maturity and lodging.

Soybean plants have diverse water requirements based on the stage of growth. For instance, limiting early-season irrigation can stimulate soybean plants to develop stronger, healthier root systems that penetrate deeper into the soil. This practice helps the plants become more resilient and better equipped to access water resources.

The most critical period for soybean irrigation is from the first flower through to seed fill. During this time, the plants need approximately 0.35 inches per day of water. When water is applied during flowering, it is especially important to also supply adequate water during seed fill. This is because the availability of water during these stages significantly affects the final yield.

Stage-of-growth scheduling works well for crops like soybeans, where irrigation timing can be guided by the crop’s growth stage. The use of this method can help optimize water use, ensuring that the plants receive enough water at the right times without wastage.

Moreover, soybeans use water efficiently. Depending on weather and soil, they use 400–700 mm of water as rainfall, irrigation, or from the soil to form a yield. This efficient use of water makes soybeans a viable crop in various climatic conditions.

Different irrigation management practices are required for soybeans and corn due to physiological differences between the plants. Therefore, understanding these differences and tailoring the irrigation practices accordingly can improve the efficiency and effectiveness of irrigation in soybean cultivation.

Soybean Irrigation Service
Soybean Irrigation Service

How Water Aids in the Growth of Soybeans

Water plays a vital role in the growth of soybeans, influencing various aspects from root development to yield production.

  • Root Development: Limiting early-season irrigation can stimulate soybean plants to develop stronger, healthier root systems that penetrate deeper into the soil. This practice makes the plants more resilient and better equipped to access water resources.
  • Growth Stage Water Requirements: Soybeans have different water requirements at different growth stages. During the vegetative growth phase, soybeans require approximately 0.7 inches of water per week. However, the water requirement doubles to about 1.4 inches per week during the flowering stages (R1 and R2). Once the bean pods start elongating (R3), water use increases even further to 1.4-1.75 inches of water per week.
  • Reproductive Growth: The peak water use period for soybeans occurs during reproductive growth, when they may need as much as 2.5 inches of water per week. Ensuring ample water supply during this period is crucial, as water availability significantly affects yield.
  • Type of Water: The quality of water used for irrigation also influences soybean growth. For instance, one study hypothesized that soybeans watered with calcium water would grow the tallest.
  • Flooding and Ponding: While adequate water is essential for soybean growth, too much water can be problematic. Spring ponding, flooding, and saturated soil conditions can negatively impact soybean seeds and young plants.
  • Irrigation Effects on Root Growth: A study conducted over three years in a sandy field found that irrigation practices influenced the root growth and development of soybean plants. Appropriate irrigation can increase the water use efficiency of crops, leading to better root development and potentially higher yields.

Techniques of Soybean Irrigation

Soybean irrigation involves several techniques designed to optimize water use, improve crop yield, and enhance overall farm productivity.

  • Irrigation Scheduling: This technique involves timing the irrigation based on the growth stage of the soybeans. This method works well for crops like soybeans, where irrigation timing can be guided by the crop’s growth stage.
  • Soil Moisture Measurement: One of the quickest and most popular methods of determining soil moisture is based on the feel and appearance of the soil. Soil water measurement devices like sensors or probes, or climatic-based systems can also be used for this purpose.
  • Drip Irrigation: Drip irrigation enables growers to have advanced control over the root environments of each soybean plant during its critical developmental stages. This method optimizes water usage, reduces wastage, and improves the overall profitability of soybean farming.
  • Mechanized Irrigation: Mechanized irrigation, including center pivots, hard hose travelers, and solid set irrigation, are commonly used for irrigating soybeans farm. These systems can cover large areas and provide precise water delivery.
  • Surface and Sprinkler Irrigation: Surface and sprinkler irrigation methods are used on soybeans. Each method has different characteristics that could make it the best for a particular situation.
  • Variable Rate Irrigation: This technique allows for the adjustment of water application rates within fields based on spatial variability in soil or crop conditions.
  • Surge, Cutback, and Furrow Packing Irrigation: Other methods for increasing uniformity include surge irrigation, cutback irrigation, furrow packing (usually for the first irrigation), and the use of other tools.
Sub-Surface Irrigation for Soybean
Sub-Surface Irrigation for Soybean

Maximizing Soybean Yield Through Irrigation

Maximizing soybean yield through irrigation involves careful planning and management of water resources. Here are some strategies based on the latest research:

  • Maintaining Adequate Soil Moisture: Soybean yields in Michigan were found to be dependent on maintaining adequate soil moisture, especially from the full flowering stage.
  • Irrigation Timing: Discontinuing irrigation before physiological maturity can result in yield penalties if the soil water content is not sufficient. Therefore, it’s important to plan ahead and ensure that the soil has enough water to support the crop till maturity.
  • Soil Management: Soybeans produce the highest yields on soils with good internal and surface drainage. Therefore, irrigation water management should concentrate on the top 3 feet of soil.
  • Addressing Water Deficit: Irrigation significantly increases soybean yield and profit margins when the crop is growing in soils with permanent or periodic soil water deficit.
  • Optimal Irrigation Management Strategy: Determining the optimal irrigation management strategy for full-season and double-cropped soybeans is essential to maximize yield and profitability. This includes deciding on the optimal row spacing and irrigation method.
  • Irrigation Scheduling: The scheduling of soybean irrigation is crucial for helping to maximize soybean yield while managing costs and reducing agronomic issues.
  • Water Use During Reproductive Stages: Soybean requires adequate water through the reproductive stages for seeds to fill properly.

A recap of our journey through the world of soybean crop irrigation affirms the critical role that proper watering plays in the successful cultivation of this high-demand crop. From understanding the precise science behind irrigation to exploring various techniques and the influence of technology, it becomes glaringly evident that water management is pivotal in maximizing soybean yield. As we step into an era where sustainable farming practices are becoming the norm, it is incumbent upon farmers to adopt and adapt to optimal irrigation strategies.

Western Irrigation Inc
(620) 275-7378
2990 Morton Rd, Garden City, KS 67846

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