Potato potential yield based on climatic elements and cultivar characteristics

Abstract

There is currently a great deal of interest in estimating crop productivity as a function of climatic elements by means of different crop weather models. An agrometeorological model is presented based on carbon dioxide assimilation maximum rates for C 3 plants, fraction of photosynthetically active radiation, air temperature, photoperiod duration, and crop parameters under tropical climate conditions. Such crop parameters include leaf area and harvest indexes, dry matter content of potato tubers, and crop cycles to estimate potato potential yields. Field data from observed productivity obtained with the cultivar Itararé (IAC-5986), grown under adequate soil water supply conditions at four different regions in the State of São Paulo (Itararé, Piracicaba, Tatuí, and São Manuel), Brazil, were used to test the model. The results revealed an excellent performance of the agrometeorological model in study, with an underestimation of irrigated potato productivity less than 10%.Key words: modelling, Solanum tuberosum L., climatic elements, crop indexes, yield. PRODUÇÃO POTENCIAL DA BATATEIRA EM FUNÇÃO DE PARÂMETROS CLIMÁTICOS E FITOTÉCNICOS RESUMOHá um grande interesse em estudos de estimativa da produtividade de culturas agronômicas em função de elementos climáticos através do uso de diversos modelos agrometeorológicos. Neste estudo, empregou-se um modelo agrometeorológico com base em taxas máximas de assimilação de dióxido de carbono para plantas de metabolismo C 3 , radiação fotossinteticamente ativa, temperatura do ar, comprimento do dia e parâmetros fitotécnicos, como índice de área foliar, índice de colheita, conteúdo de matéria seca dos tubérculos e duração do ciclo fenológico da cultura para estimar a produtividade potencial da batateira. Dados de campo obtidos a partir de produtividades observadas com a cultivar Itararé (IAC-5986), sob condições de suprimento adequado de água no solo para quatro localidades distintas do Estado de São Paulo (Itararé, Piracicaba, Tatuí e São Manuel), Brasil, foram utilizados para testar o modelo. Os resultados revelaram um excelente desempenho do modelo climático em estudo, com subestimativas de rendimento potencial inferiores a 10%.Palavras-chave: modelagem, Solanum tuberosum L., elementos de clima, índices culturais, produção. A.B. Pereira et al.

Evaluation of DSSAT model for sprinkler irrigated potato: A case study of Northeast Algeria

“…The statistics evaluation associated with the average error between observed and simulated values of the six plots presents RMSE and BIAS values of 3.45 t ha -1 and -7.34, respectively. These results are analogous to those indicated by Pereira et al (2008) in Brazil (Itararé IAC-5986 cultivar), Medany (2006) Valour cultivar, Abdrabbo et al (2010) in Egypt (Valour and Desiree cultivar), and Daccache et al (2011) in England's humid climate (Bintje cultivar). For this author, the differences expressed as a percentage between the simulated and observed mean yields were very small (1 to 3%).…”

Influence of plant density and hilling on yield and profitability of arrowroot1

“…The increase of plant population as a function of the reduction in plant spacing in the rows provided a higher rhizome yield, which also increased the leaf fresh and dry mass (Figure 1) through a better radiation absorption without competition, a decisive variable in plant growth (Pereira et al 2008).…”

Analyzing the impact of agrometeorological factors on winter rye yield in the Central Non-Black Soil zone

“…The sig nif i cant num ber of stud ies that deal with the anal y sis of the im pact of agrometeorological and agroclimatic fac tors on the crop yield, have been car ried out by now. For ex am ple, nu mer ous meth ods of its fore cast ing are pre sented in mono graphs [2,6,13] and sci en tific pa pers [9,11,19].…”