Yield of Potato Cultivars as a Function of Nitrogen Rates

Abstract

The use of fertilizers at appropriate doses positively impacts the production and the environment. Therefore, we aimed to evaluate the influence of nitrogen (N) rates on the crop yields of the potato cultivars, Ágata and Atlantic in Unaí, Minas Gerais (MG), and Ágata in Mucugê, Bahia (BA), Brazil. The cultivation of Ágata and Atlantic was conducted in MG from May to August and June to September 2014, respectively. In BA, Ágata was cultivated between September and December 2014. A random block experimental design was used with treatment rates of 0, 30, 70, 120, and 280 kg ha-1 of N. The macro and micronutrient concentrations in potato leaves were evaluated. At the end of the growth cycle, the production of tubers was also evaluated. In the absence of N application, it was observed that P, K, S, and B were below the adequate levels in Atlantic-MG, the S and Zn levels were lower than the adequate levels in Ágata -MG, and the N, K, Mg, and S levels were less than the adequate levels in Ágata-BA. The other nutrients met the needs of the potato, with the N increase being favorable to the levels of most nutrients in all experiments. The maximum rates of N varied between 138 and 194 kg ha-1 in the high and low cationic exchange capacity (CEC) regions, respectively. The knowledge of the interaction among soil attributes, climate conditions and crop specificities allows for the improved prediction of the dosage of N and a reduction in the optimum amount without affecting yields.

Genotype–environment interaction and yield stability analysis of Colombian yellow diploid potato cultivars using mixed linear models and environmental covariates

“…Oliveira, Luz et al. (2020) studied GEI and fresh biomass yield stability of sorghum ( Sorghum bicolor L. Moench) hybrids in different locations and years, using factor analytical (FA) mixed models and environmental covariates, finding moderate correlations between some environmental covariates and FA model loadings, and suggesting possible factors to explain GEI among environments grouped in a given factor. Thus, precipitation, minimum temperature, and wind speed were correlated with the environmental loadings of factor 1, while solar radiation and altitude presented the highest loadings for factor 2.…”

“…From the proposed model, it was determined that the length of the crop cycle is affected by intercepted radiation, and depending on phe-nology, its effects can be positive or negative on crop yield, containing 12% of the variation explained by the model; also, high rainfall has a negative effect on yield, explaining 6% of the variation. R. Oliveira, Luz et al (2020) studied GEI and fresh biomass yield stability of sorghum (Sorghum bicolor L. Moench) hybrids in different locations and years, using factor analytical (FA) mixed models and environmental covariates, finding moderate correlations between some environmental covariates and FA model loadings, and suggesting possible factors to explain GEI among environments grouped in a given factor. Thus, precipitation, minimum temperature, and wind speed were correlated with the environmental loadings of factor 1, while solar radiation and altitude presented the highest loadings for factor 2.…”

“…5.5-6.0 yields were higher, while pH above or below this range could negatively affect cultivar yield. R. Oliveira, Luz et al (2020) found that CICE approximately 10 meq/100 g of soil positively affected potato crop yield; presenting a higher concentration of cationic bases in the soil improves the availability of nutrients for uptake by transpiration flow; and at high pH, the availability of some nutrients, such as Ca and Mg, which are retained in the soil, is affected (Cambouris et al, 2016).…”