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Early growth of sunflower hybrids cultivated in nutritive solutions with macronutrient omissions

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Author: 
Janderson do Carmo Lima, Bruno Laecio da Silva Pereira, Anacleto Ranulfo dos Santos and Gilvanda Leão dos Anjos
Abstract: 

Sunflower (Helianthus annus L.) is an oilseed that has important agronomic characteristics, such as: greater resistance to drought, cold and pests than most species normally grown in Brazil. Nitrogen and phosphorus play an important role in the metabolism and maturation of the sunflower crop; The nitrogen when omitted causes nutritional imbalance and phosphorus because it is a nutrient after being absorbed by the plant to be incorporated in organic compounds including phosphate sugars, phospholipids and nucleotides, causing a significant reduction of the development of the plants, affecting the number of leaves, the height of the plants, Stem diameter and leaf area. The experiment was carried out in a greenhouse at the Federal University of Recôncavo da Bahia located in Cruz das Almas - BA. The experimental design was completely randomized, consisting of eight treatments, two hybrids and five replications, totaling eighty vessels. The nutrient solution of Hoagland and Arnom (1950), modified by Sarruge and Haag (1974), was used. The treatments studied were: T1- Complete Solution; T2- Omission of N; T3- Omission of P; T4 - Omission K; T5- Omission of NP; T6- Omission PK, T7- Omission of NPK and T8- Omission of micronutrients. The initial growth H251 and H360 was compromised when submitted to solutions with nitrogen omission. There were positive interactions between the solution with omission of phosphorus and potassium with the two genotypes for the variables index of chlorophyll a, and H360 for the dry mass of leaves and dry mass of the aerial part. Hybrid H251 was more sensitive to macronutrient deficiency than H360.

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