Among the factors that affect peach productivity is the proper nutrition of plants, being nitrogen (N) one of the main nutrients for the crop. Thus, the objective of the current study was to evaluate the effect of nitrogen fertilization on macronutrient leaf contents, plant development and production of different genotypes of peach trees cultivated at high planting density, seeking to recommend the most appropriate concentration. The experiment was conducted between 2016 and 2018 using peach selections ‘Cascata 1513’ and ‘Cascata 1067’ and with nitrogen fertilization concentrations (0, 60, 120 and 180 kg ha-1 of N). Pruning mass, trunk diameter, number of fruits per plant, average fruit mass, yield per plant, yield per hectare and leaf macronutrients were evaluated. The increase of N concentration increases the N content in leaves. For the conditions of this experiment the maximum production per plant was obtained for the highest dose of 180 Kg ha of N.
O tempo que os pêssegos permanecem em temperatura ambiente após a colheita, pode comprometer a qualidade dos mesmos. A partir disso, o presente estudo, propôs-se avaliar diferentes períodos que compreende a colheita dos frutos e a sua submissão ao armazenamento refrigerado em relação à qualidade dos pêssegos ‘BRS Kampai’. Os tratamentos foram: T1: após 4 horas da colheita, os frutos foram armazenados em ambiente refrigerado; T2: após a colheita os frutos permaneceram por 24 horas em temperatura ambiente e após armazenados em ambiente refrigerado; T3: após a colheita os frutos permaneceram por 36 horas em temperatura ambiente e após armazenados em ambiente refrigerado. Os frutos permaneceram durante 10 e 20 dias em armazenamento refrigerado, seguidamente de dois dias a temperatura ambiente. As variáveis analisadas foram à perda de massa, firmeza, coloração da epiderme, teor de sólidos solúveis, pH e acidez titulável. Constatou-se que o período em que estes permanecem em temperatura ambiente antes de serem submetidos ao armazenamento refrigerado, influencia nas características de conservação e qualidade dos frutos. Com isso, a menor perda de massa e a maior firmeza, após o armazenamento, são observadas nos frutos que após quatro horas da colheita foram alocados no armazenamento refrigerado.
In cultivation of peaches, thinning is conventionally performed on fruits by hand, and needs to be done in a short time and with specialized labor, which increases the operational costs of this practice. Mechanical thinning can be an alternative to manual fruit thinning. Thus, the objective of this study was to evaluate the effect of mechanical flower thinning with different equipment in advanced peach orchard. The experiment was conducted in 2016 and 2017, combining advanced selections of peach trees and thinning methods. The evaluated variables were percentage of flowers thinning, thinning time, fruit number per plant, plant production, estimated yield, average fruit mass and fruit diameter class. Flower mechanic thinning alters the yield index of peach trees. Mechanical thinning on peach trees was efficient in flower thinning and reduced the practice execution time. Therefore, mechanical thinning is an alternative to the manual fruit thinning of peach trees.
A adubação do morangueiro é uma das principais práticas responsáveis pelo aumento da produção. Entretanto, ainda são insuficientes as informações sobre o efeito da omissão dos nutrientes minerais sobre o desenvolvimento do morangueiro. Neste contexto, o objetivo deste trabalho foi avaliar o crescimento dos morangueiros, visualizar os sintomas de deficiência nutricionais e os teores de nutrientes nas folhas decorrentes da omissão de macro e micro nutrientes. O delineamento experimental utilizado foi o inteiramente casualizado, com dez tratamentos e três repetições. Os tratamentos constituíram-se de solução completa e omissão individual de cada um dos seguintes nutrientes: nitrogênio (N), fósforo (P), potássio (K), cálcio (Ca), magnésio (Mg), cobre (Cu), manganês (Mn), zinco (Zn) e ferro (Fe). Avaliou-se: a massa fresca e seca da raiz, da parte aérea e da coroa, número de folhas e coroas, teores de macro e micronutrientes nas folhas e sintomas visuais de deficiência nutricional. A massa fresca e seca da parte aérea, o número de coroa e o número de folhas são mais prejudicados pela ausência de macronutrientes. O desenvolvimento do sistema radicular do morangueiro é menor na omissão dos macronutrientes. Menores teores de N, P, K, Ca, Mg e Fe nas folhas de morangueiro ocorrem quando são realizadas omissão desses elementos
The objective of this research was to evaluate the technical feasibility of SPAD index in the diagnosis of N status in ‘Esmeralda’ peach. The field trial, with five N rates applied to the soil (0, 40, 80, 120 and 160 kg ha-1 of N as urea form) was conducted in a randomized block design with four replications. During the years 2014, 2015, 2016 and 2017, SPAD readings were carried out with a Minolta SPAD-502 chlorophyll meter, in the leaf middle part, in 40 leaves per plot. The leaf N content determination was performed in CHN-S Elemental Analyzer. SPAD index and leaf N content increased in a linear way in response to increasing N rates applied in soil. There was a positive linear correlation between SPAD index and N concentration in leaves (0.652; 0.756; 0.762 and 0.767, p<0.05). SPAD index can be used for nutritional N diagnosis purpose in peach when readings are taken between the 13th and 15th weeks after full bloom. In the range between 39 and 49, the SPAD index indicates the leaf N content is included in “normal” class (33 – 45 g kg-1) of agronomic interpretation for the States of Rio Grande do Sul and Santa Catarina, Brazil.
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