I often receive questions on how much water should apply to high tunnel tomatoes. Even the most experienced tomato growers could sometimes lose yield because of overlooking irrigation management. In this article, I describe a case study of how we use soil moisture sensors for irrigation management in a high tunnel tomato production system. This[Read More…]
Irrigation
Irrigation is now becoming more critical. Temperatures are high, and many areas are experiencing lower-than-normal rainfall. However, I do have some good news for you if you are looking for a source that has a lot of information about irrigation. Lyndon Kelley is an Irrigation Educator for Purdue Extension and MSU Extension, and he maintains[Read More…]
Tomatoes need a consistent water supply when they start to bloom and set fruit. As plants grow more foliage and have more fruits set, their water needs increase. As a result, the irrigation amount must steadily increase to maintain the consistent soil water content and the water supply to the plants. What would happen if[Read More…]
We discussed wetting patterns in drip irrigation in a previous article. The take home message is drip irrigation applies water to only a portion of the soil. Uneven water distribution in the soil profile is not a problem as long as enough water is applied to the crop. However, the water wetting pattern might influence[Read More…]
At Pinney Purdue (PPAC) bell peppers were harvested for the first time on August 15. Plants appear a little larger in the irrigated plots than in the unirrigated plots, but it is not obvious in photographs (Figure 1). Similar to what was observed at SWPAC, blossom end rot (BER) was much more common in the[Read More…]
A major difference between drip irrigation and other irrigation methods is that drip irrigation applies water to only a portion of the soil. This works great for vegetables grown on the plastic mulch, since no irrigation water is applied between the row middles; water applied to row middles encourages weed growth. So, does the soil[Read More…]
At Pinney Purdue (PPAC) 2.67 inches of rain fell July 27 through August 9. The potential evapotranspiration (PET) over the period was 1.68 inches. Estimates for water use by the crops are equal to or just slightly lower than potential evapotranspiration. For tomatoes, estimated water use was 1.68 inches, and for watermelons, 1.52 inches. There[Read More…]
At Pinney Purdue (PPAC) 2.19 inches of rain fell July 12 through July 26. The potential evapotranspiration (PET) over the period was 2.67 inches. Estimates for water use by the crops are somewhat lower than potential evapotranspiration. For tomatoes, estimated water use was 2.03 inches, and for watermelons, 1.54 inches. Dry periods between heavy rains[Read More…]
At Southwest Purdue Ag Center (SWPAC), more than 10 inches of rain fell since July 7; over 8 inches happened since the evening of July 24. Soil water content on the unirrigated tomato/pepper/eggplant bed (12’’ under plastic mulch) increased from 10% (early July) to about 15% after 3 inches of rain on July 7-9. The[Read More…]
At Pinney Purdue (PPAC) 1.66 inches of rain fell June 25 through July 11. The potential evapotranspiration (PET) over the period was 2.79 inches. Estimates for water use by the crops are lower than potential evapotranspiration because it is only 5 weeks after transplanting. For tomatoes, estimated water use was 2.01 inches, and for watermelons,[Read More…]