Alex Miller† and Krishna Nemali†† † Graduate student, Horticulture and Landscape Architecture, Purdue University †† For correspondence: knemali@purdue.edu   Lettuce is one of the major leafy greens grown in hydroponic greenhouses. Lettuce production in greenhouses during winter can provide year-round income to Indiana hydroponic growers. Many growers assume that lettuce is a cool season crop…Read more about Growing hydroponic lettuce using heated nutrient solution under cooler air temperature[Read More]

Alex Miller† and Krishna Nemali†† † Graduate student, Horticulture and Landscape Architecture, Purdue University †† For correspondence: knemali@purdue.edu   Winters in the mid-west are generally harsh. The daily average temperature during winter months (Nov. to Feb) in Indiana is 33.6 oF. This temperature is significantly lower than the optimal growth temperature (65 to 75 oF)…Read more about Calculating Greenhouse Heating Requirements[Read More]

Pore space in soilless substrates Do you know that you are mostly paying for ‘pore space’ when buying a bag of soilless substrate? This is because, unlike mineral soils, nearly three-fourth volume of soilless substrates is pore space. I like to refer pore space as the ‘functional’ component of a substrate.   By definition, pore space…Read more about Looking through the pores of a soilless substrate[Read More]