Field-based screening methodology to improve tolerance of common bean to low-P soils

被引:4
作者
Aggarwal, VD
Mughogho, SK
Chirwa, RM
Snapp, S
机构
[1] Bean Research Program, Lilongwe
关键词
D O I
10.1080/00103629709369902
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Phosphorus (P) limits common bean (Phaseolus vulgaris L.) production throughout sub-Saharan Africa, where P fertilizer is not affordable to the vast majority of smallholder farmers. Genetic differences in bean performance in low-P soils suggest that low P tolerance could be improved. Earlier breeding efforts have not been successful, in part due to the challenges of selecting genotypes with improved performance in a heterogeneous soil environment. A field based screening method for low P tolerance has been developed, based on evaluating soil status and ameliorating edaphic compounding factors. The soil is classified as an Oxic Haplustalf and is representative of the unimodal, mid-to-high altitude bean growing regions of Southern Africa. The soil has very low zinc (Zn) and nitrogen (N) contents, which reduced growth markedly. After amelioration of these edaphic complications, P response could be quantified. A promising genotype CAL 143 was selected which consistently expressed, over two growing seasons, low P tolerance and high yield responsiveness to moderate fertilizer P application.
引用
收藏
页码:1623 / 1632
页数:10
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