Water stress pattern for corn (first and second crop) in the Goias State and their consequences for the breeding program

被引：9

作者：

Heinemann, Alexandre Bryan ^{[1
]}

Teixeira de Andrade, Camilo de Lelis ^{[2
]}

Gomide, Reinaldo Lucio ^{[3
]}

Amorim, Andre de O. ^{[4
]}

da Paz, Rosidalva Lopes ^{[4
]}

机构：

[1] Embrapa Arroz & Feijao CNPAF, BR-75375000 Santo Antonio De Goias, Go, Brazil

[2] Embrapa Milho & Sorgo, Nucleo Solo Agua & Sustentabilidade Ambiental NSA, BR-35701970 Sete Lagoas, MG, Brazil

[3] Embrapa CNPMS, Embrapa Milho & Sorgo, BR-35701970 Sete Lagoas, MG, Brazil

[4] Secretaria Estado Ciencia & Tecnol SECTEC, Sistema Meteorol & Hidrol Estado Goias SIMEHGO, BR-74088900 Goiania, Go, Brazil

来源：

CIENCIA E AGROTECNOLOGIA | 2009年 / 33卷 / 04期

关键词：

Growth model; Zea mays; Brazilian savanna; dry spells; water stress; AFFECTING GRAIN-SORGHUM; ENVIRONMENT; SELECTION; GENOTYPE;

D O I：

10.1590/S1413-70542009000400012

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

Water stress is a major constraint to crop production and yield stability in many regions of the world. The cultivation of corn (Zea mays L.) in the Brazilian State of Goias, is frequent affected by periods of water stress resulting in yield reduction. During the process of developing new hybrids and cultivated varieties, new genotypes are selected based on their adaptability for a certain environment. In this context, plant breeding programs demand for information regarding as a function of the crop phenological phases. A crop simulation model was used to determine patterns of water stress for 12 locations of the State of Goias and 6 different sowing for both, first and second corn harvest periods. For the first harvest period, yield loss due to water stress was lower than 50%, with higher effects on yield in the beginning of the reproductive period. For corn as a second crop, yield loss is higher than 50% with frequent occurrence of terminal stress, which presented higher intensity during the stage of grain filling.

引用

页码：1026 / 1033

页数：8