Aplicación de diferentes fuentes nitrogenadas y su influencia en la morfología, fisiología y productividad de cacao Theobroma cacao L. CCN51

Cocoa is a crop of global interest, despite the information generated about it there is still a gap in aspects of nutrition related to the physiology of the plant. Nitrogen is an essential macronutrient and is absorbed by plants as ammonium or nitrate ions; the difference in its application changes the concentration and proportion of cations in the soil. For this reason, the effect of different nitrogenous sources on 5-year-old CCN51 cocoa was evaluated in the province of Zamora Chinchipe. Four treatments were established with the same dose of N, which varied only in the source plus a control: T1= control without application of N, T2= urea, T3= calcium nitrate and T4= ammonium sulfate. The applications were made, every 30 days. The growth of selected sprouts and fruits, macronutrients in leaves and soil, soil pH, bromatological characteristics of the grain, yield and agronomic efficiency of the used sources were evaluated, all these variables were correlated and an ANOVA was made to each one independently. There were not found significant differences in vegetative variables, neither in the physical characteristics of the kernel, however, there were produced different effects in the content of nutrients and pH of the soil, this way. The SA and the urea acidified in a bigger proportion and at the same time they allowed a bigger content of N in the soil, besides, the use of SA increased the content of fat in the kernel in comparison to the urea, counting also with a bigger number of fruits by plant and therefore better yield. In terms of agronomic efficiency, SA was twice as efficient as NC and four times as efficient as urea. In conclusion, the vegetative development of the plant is not affected by the nitrogen source used; as for the yield, the ES generates a higher production but its acidifying effect on the soil pH must be a factor to consider and analyze in the case of continuous applications. Key words: Ammonium sulphate, calcium nitrate, urea, yield

• Главный автор: Romero Maza, Adriana Elizabeth (author)
• Формат: bachelorThesis
• Язык: spa
• Опубликовано: 2020
• Предметы: SULFATO DE AMONIO; NITRATO DE CALCIO; RENDIMIENTO
• Online-ссылка: https://dspace.unl.edu.ec/jspui/handle/123456789/23594