Citas bibligráficas
Rodríguez, A., (2016). Dinámica de la respuesta del cultivo de camote (Ipomoea batatas L.) al estrés hídrico y salino [Tesis, Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/2813
Rodríguez, A., Dinámica de la respuesta del cultivo de camote (Ipomoea batatas L.) al estrés hídrico y salino [Tesis]. : Universidad Nacional Agraria La Molina; 2016. https://hdl.handle.net/20.500.12996/2813
@phdthesis{renati/1116999,
title = "Dinámica de la respuesta del cultivo de camote (Ipomoea batatas L.) al estrés hídrico y salino",
author = "Rodríguez Delfín, Alfredo Salomón",
publisher = "Universidad Nacional Agraria La Molina",
year = "2016"
}
Three trials were performed at the Hydroponics Module of the La Molina National Agrarian University, Lima, Peru (latitude 12° 05’ 06” south, longitude 76° 51’ 00” west; elevation 243 meters above sea level). The trials were performed from April to September 2006; from January to April 2007 and, from February to May 2009, respectively. It were tested the following sweet potato cultivars: ‘Huambachero’ (INIA-306), ‘Jewel’ (CIP 401562), ‘Toquesita’ (CIP 440045), ‘Camote Sal’ (CIP 420068) and Untacip (CIP 188022). In Trial 1, plants of the 'Huambachero' cultivar were grown with fifteen different N, P2O5 and K2O fertilization levels. The response surface methodology was used to determine the interaction between the different N, P2O5 and K2O independent variables levels across the dependent variables of fresh and dry tuber roots weight, total dry weight, total chlorophylls content and macronutrients uptake. In Trial 2, plants of four sweet potato cultivars were grown with three N, P2O5 and K2O fertilization levels. It was evaluated the growth and yield and the macronutrients uptake in leaves and tuberous roots. In Trial 3, two sweet potato cultivars with different salinity response "Huambachero" and "Untacip" were evaluated. The salinity effect was obtained through the use of a nutrient solution with three NaCl levels: 0, 8 and 14 mmol, with electrical conductivities of 2.0, 3.0 and 3.5 dS/m respectively. To evaluate the stressors effect in plants, it were evaluate proline and total chlorophylls content and the macronutrients uptake in leaves and tuberous roots. The tuber roots yield is dependent of the production rate and dry matter partitioning within the plant, which would have been affected by the mineral nutrients uptake. The increased of N, P2O5 and K2O fertilization levels above the optimal levels, decreased the yields of the different sweet potato cultivars tested. 35 Tuber roots yields were also affected by the water restriction and salinity. No differences between cultivars in the tuberous roots yield under high salt stress were found. Water stress caused a lower extraction of N, P, Ca, Mg, K and Na. The salt stress caused a lower P, K and Mg extraction and higher Na extraction. Huambachero cultivar showed lower extraction of P, K, Ca, Mg and Na due to water stress, while the extraction of these five nutrients in Untacip cultivar was similar. Both stress conditions caused increased levels proline, mainly in tuber roots. The results suggest that under the conditions tested Untacip cultivar is more tolerant than Huambachero.
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