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→What are the advantages of subsurface drip irrigation?
1. Water Conservation: Drip irrigation wets only the root-zone area of crops, making it a localized irrigation method that prevents deep seepage and lateral runoff. When combined with subsurface drip irrigation under plastic mulch, it significantly reduces inter-row evaporation, leading to water savings of over 80% compared to traditional flood irrigation methods.
2. Fertilizer Efficiency: Water-soluble fertilizers are delivered directly to the crop root zone beneath the plastic mulch via the drip system, enabling more efficient nutrient uptake by the roots. This minimizes fertilizer losses due to volatilization and runoff, boosting fertilizer utilization rates from the typical 30%-40% to an impressive 60%-70%.
3. Labor Savings: Subsurface drip irrigation typically eliminates the need for regular tillage. Additionally, water-soluble fertilizers and plant growth regulators can be easily applied directly through the irrigation system, further reducing the labor required for field maintenance.
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→Winter Greenhouse Irrigation Timing and Methods
In winter, greenhouse vegetable irrigation should be scheduled on sunny days, ideally with several consecutive clear days following the watering. The best time of day to water is in the morning—this not only minimizes the temperature difference between the water and soil, allowing soil temperatures to recover more easily, but also provides ample time for moisture to dissipate. It’s generally not advisable to water at noon, as high temperatures at that time could disrupt root growth functions. Similarly, avoid irrigating in the evening or during windy, snowy conditions, as these scenarios might lead to excessive humidity inside the greenhouse, potentially triggering widespread outbreaks of vegetable diseases.
When greenhouse vegetables suffer from severe water shortages, plants will wilt, and leaves may turn scorched and brittle. Conversely, overwatering can deprive the soil of oxygen, causing root suffocation and rot, while the aboveground stems and foliage may yellow or even die altogether. In winter greenhouses, where temperatures are low and ventilation is limited, proper irrigation management is crucial to prevent both drought stress and waterlogging.
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