Reduction of interrow spacing in cassava (Manihot esculenta Crantz) production

A. D. Santiago, S. O. Procópio, C. Ferreira, G.B.P. Braz
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Abstract

The interrow spacing commonly used in cassava cultivation in Brazil, especially in the Agreste region of Alagoas, ranges from 100 to 120cm. However, the reduction in row spacing can provide agronomic and environmental benefits in cassava cropping systems. Thus, this work aimed to evaluate the performance of two cassava varieties cultivated with reduced interrow spacing. Two experiments were conducted in the field, one in 2015/16 and another in 2017/18. A Split Plot design with four replications was used in both experiments. Four interrow spacing were evaluated in the main plot: 60, 80, 100 and 120cm, with plants spaced 60cm apart within rows, giving populations of 27,778, 20,833, 16,667 and 13,889 plants per hectare, respectively. In the subplots, two cassava varieties were evaluated: Caravela and Pretinha. An increase in interrow spacing promoted a linear reduction in the stem green mass of cassava. Plant height, leaf green mass, main stem diameter, root yield, tuberous root length, tuberous root diameter, flour percentage, flour yield, and starch content were not influenced by changes in interrow spacing. The Pretinha variety was superior to Caravela in the following evaluated traits: stem green mass, the diameter of tuberous roots, root yield, plant height, and flour yield. The results indicate the possibility of altering the interrow spacing in cassava to assist in the cultural management, without impacting crop yield.  
木薯(Manihot esculenta Crantz)生产中减少行距
在巴西,特别是在阿拉戈斯州的阿格里斯特地区,木薯种植常用的行距为100至120厘米。然而,减少行距可以为木薯种植系统提供农艺和环境效益。因此,本研究旨在评价两种减少行距栽培的木薯品种的表现。在2015/16年和2017/18年分别进行了两次野外试验。两个实验均采用4个重复的分割图设计。主样地的行距分别为60、80、100和120cm,行距为60cm,种群数量分别为27,778、20,833、16,667和13,889株/公顷。在小样中,对两个木薯品种:卡拉维拉和普雷蒂尼亚进行了评价。行距的增加促进了木薯茎绿质量的线性减少。株高、叶绿质量、主茎粗、根产量、块根长、块根直径、成粉率、成粉率和淀粉含量不受行距变化的影响。在茎绿质量、块根直径、根产量、株高和产粉量等性状上,普雷蒂娜均优于卡拉维拉。研究结果表明,在不影响作物产量的情况下,改变木薯的行距有助于栽培管理。
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