International Journal of Advanced Engineering Research and Science (IJAERS) [Vol-7, Issue-2, Feb- 2020] https://dx.doi.org/10.22161/ijaers.72.38 ISSN: 2349-6495(P) | 2456-1908(O) www.ijaers.com Page | 283 Yield parameters of two maize hybrids submitted to different spacing in Paraibano Semiarid, Brazil Uriel Calisto Moura Pessoa 1 , Anielson dos Santos Souza 2 , Rafael Vítor da Silveira Muniz 3 , Alberto de Andrade Soares Filho 4 , Martiliana Mayani Freire 5 , Laís Barreto Franco 6 , Joaquim Vieira Lima Neto 7 1 Master degree student in Department of of Agricultural Engineering, Federal Rural University of Pernambuco-UFRPE, Dom Manuel de Medeiros Street – Dois Irmãos, Recife-PE, zip code 52171-900, Brazil Abstract— One of the most important crop practices to obtain high grain and forage yields in maize is the correct management of the seeding density, because the plant stand can influence growth components, production and partitioning of photoassimilates. The objective of this study was to evaluate the growth and yield of corn cultivation at five spacings, using two hybrids. The experiment was installed at the experimental farm of the Federal University of Campina Grande, CCTA/UFCG, Campus de Pombal, located in the city of Santo Domingo—PB. The experimental design was a randomised complete block, in a factorial scheme, with the factors being five spacings and two hybrids, with four replications. The spacings were 0.15, 0.30, 0.45, 0.60 and 0.75 m between plants, and the two hybrids were ‘AG-1051’ and ‘BR-106’. The following yield components were evaluated: ear weight with straw and without straw; weight of 1000 seeds, ear length and diameter, grain yield and mass of corn. The spacings of 0.30 and 0.45 m had the best results, corresponding to the population densities of 30,000 and 40,000 plants ha -1 , and the ‘AG-1051’ cultivar had the best performance, with an average yield of 13 t ha -1 , largely due to its better genetic load. Keywords— Productivity, sowing densities, Zea mays (L). I. INTRODUCTION Corn (Zea mays L.) is a monocot the Poaceae family, native to Central America, and it is among the most cultivated cereals consumed in the world, due to production potential, chemical composition, nutritional value, multiplicity of applications and high adaptability, which facilitate cultivation beyond the broad market [12]. Among the various factors that may interfere with the productivity of the corn, seeding density and arrangement appear to be the main factors responsible for the low yield of corn in Brazil [13]. This is because the plant stand can affect the growth of the culture components due to increased competition in assimilate partitioning [2]. The ideal population to maximise the yield of corn grain ranges from 30 to 90 thousand ha -1 plants, depending on the availability of water, soil fertility, sowing and spacing adopted among rows and among plants in the cultivation line in addition to cultivating characteristics, which are crucial to plan the density of plants [8]. According to [14], studies indicate that modern hybrids have had a reduction in spacing from 0.9 to 0.4–0.6 m, and an increase in the population of plants 60 to 75 ha -1 plants. [17] showed that plant populations between 60 and 80 thousand plants ha-1 showed increases in productivity of approximately 12.5 to 13.6%, corresponding to spacing between plants in the row of 0.6 and 0.8 m. The use of higher plant densities in smaller spacing allows greater interception of photosynthetically active radiation, promoting higher grain yields per plant [15]. According [19] the management of plant density is one of the cultural practices that most interferes with the productivity of maize. This response is associated with the fact that maize does not have an efficient space compensation mechanism, since it tends little and has low prolificacy and limited expansion capacity. The effects of density are also reflected in genotype hybrids with smaller numbers of leaves that are upright, with lower biomass production, which reduces the interference of one plant with another [9]. Considering the importance of obtaining high yields and knowledge about the double spacing recommendations between rows of commercial hybrids, this work was to evaluate the influence of five spacings cultivation, growth and productivity of two hybrids of commercial corn.