Efeito do espaçamento de plantio no crescimento, desenvolvimento e produtividade da mandioca em ambiente subtropical

Abstract

The objective of this study was to analyze the effect of different plant spacing on growth, development and stems and roots yield of cassava in a subtropical environment in Rio Grande do Sul State, Brazil. Treatments consisted of four spacings: 0.8x0.8 m, 1.0x1.0 m, 1.2x1.2 m, 1.5x1.5 m, corresponding to densities of 15,625 plants ha , respectively. The cultivar used was Fepagro -RS 13. The variables of growth and development analyzed were green leaf area, plant height, number of senescent leaves, internode length, final leaf number (FLN), number of lateral shoots, final leaf size, phyllochron and stem and root fresh and dry weight yield. The maximum leaf area index and phyllochron increased as plant density increased. The final leaf size and number of lateral shoots increased as plant density decreased. FLN differed only for the second sympodial branching, with the highest number of leaves at the 1.5x1.5m plant spacing. Stem yield of the cultivar Fepagro -RS 13 does not change with plant spacing, but tuber root yield per area is higher at higher densities, while yield per plant and per root is higher at lower densities.Key words: Manihot esculenta Crantz, plant density, phyllochron, LAI.Efeito do espaçamento de plantio no crescimento, desenvolvimento e produtividade da mandioca em ambiente subtropical , respectivamente. A cultivar usada foi a Fepagro -RS 13. As variáveis de crescimento e desenvolvimento analisadas foram área foliar verde, altura das plantas, número de folhas senescidas, comprimento de entrenó, número final de folhas (NFF), número de brotações laterais, tamanho final de folhas, filocrono e produtividade de haste e raiz em massa fresca e seca. O índice de área foliar máximo e o filocrono aumentam à medida que aumenta a densidade de plantio. O tamanho final de folha e o número de brotações laterais aumentaram à medida que diminuiu a densidade de plantio. O NFF diferiu apenas na segunda ramificação simpodial (RS2), com maior número de folhas nas plantas espaçadas a 1,5x1,5 m. A produtividade de hastes na cultivar Fepagro -RS 13 não varia com o espaçamento de plantio, mas a produtividade de raízes por área é maior nas densidades maiores, enquanto que a produtividade por planta e por raiz comercial é maior nas densidades menores.Palavras-chave: Manihot esculenta Crantz, densidade de plantas, filocrono, IAF.

Resistance and Correlation of Pod Shattering and Selected Agronomic Traits in Soybeans

“…Plant density might have played additional role resulting in differences in plant height observed during the two cropping seasons. This is consistent with Amaglo et al (2006) ; Augusto et al (2014) who found that a good rainfall pattern and a closer spacing leads to higher increases in soybean plant height, while wider spacing shows relatively lower increases of plant height. Wycliffe (2015) on the other side, found that long rain soybean crop in western Kenya were generally taller compared to those grown during the short rains.…”

Plant Growth Pattern, Forage Yield, and Quality of Indigofera zollingeriana Influenced by Row Spacing

“…It is likely that the greater distance between adjacent plants within rows enhances the abilities of the plants to convert the intercepted solar radiation to leaf production (Streck et al, 2014).…”

“…Plants spaced equidistantly from each other compete minimally for nutrients, light, and other factors (Agele et al, 2007). The narrow plant spacing had positive effects on plant density and yield per area (Murányi, 2015), green leaf area, plant height, number of leaves, final leaf number, and final leaf size (Streck et al, 2014). In addition, the narrow rows canopied more quickly, which reduced weed pressure (Grosbach, 2008) and weed biomass (Chauhan & Opeña, 2013).…”

“…In addition, the narrow rows canopied more quickly, which reduced weed pressure (Grosbach, 2008) and weed biomass (Chauhan & Opeña, 2013). In other side, the wider plant spacing had a positive effect on yield per plant and root (Streck et al, 2014).…”

Influence of irrigation, planting density and vegetative propagation on yield of rhizomes of starch the arrowroot

“…The extraction of the starch is a way to conserve the nutritional characteristics of the rhizome, because it is a product powder, therefore it presents / displays low water activity and thus long storage period. For industry, these results are of fundamental importance as they are associated with the final cost of the product (Streck et al, 2014). Table 3 shows the combined effect of irrigation and plant material, as well as the plant material and plant density in the starch yield.…”