Greenhouse Management Final Exam 2025/2026 – 100+ Q&A on Nutrient Deficiency, Substrates, Environmental Control & Fertilizer Use

This document offers a comprehensive compilation of 100+ final exam questions and verified answers for the Greenhouse Management course, prepared for the 2025/2026 academic year at Albany Technical College and similar horticulture and plant science programs. It provides in-depth coverage of critical topics in greenhouse production, with emphasis on soilless media, plant nutrient management, environmental control systems, fertilization practices, and plant physiological responses. Students will review essential concepts such as the chemical and physical selection criteria of substrates (e.g., pH, CEC, AEC, WHC, bulk density), components of common soilless mixes (peat, vermiculite, perlite, coir), and reasons why soil is not preferred for greenhouse systems. Environmental controls including ventilation, humidity, temperature, light, and air composition are explored alongside key metrics like Relative Humidity (RH), Absolute Humidity (AH), Saturated Moisture Content (SMC), and Humidity Deficit (HD). The guide also includes detailed descriptions of macronutrients and micronutrients, such as nitrogen, phosphorus, potassium, calcium, iron, and boron, their roles, and deficiency symptoms. Core principles of the 4R Nutrient Stewardship (Right Rate, Right Source, Right Time, Right Place) are tested, alongside visual signs of water stress, causes of salt buildup, and key processes like ventilation and leaching. This document is ideal for students in horticulture, greenhouse operations, agronomy, plant science, and controlled environment agriculture, and is also useful for growers, greenhouse managers, and candidates preparing for certification exams in sustainable crop production. Keywords: greenhouse management, soilless substrate, nutrient deficiency, macronutrients, micronutrients, peat, perlite, vermiculite, coir, air holding capacity, water holding capacity, EC, pH, CEC, nutrient stewardship, 4R, ventilation, RH, AH, SMC, HD, nitrogen fertilizers, chlorosis, blossom end rot, fertilizer application, leaching, water management, Albany Technical College