XI International Agriculture Symposium "AGROSYM 2020", Sarajevo, Bosna-Hersek, 8 - 09 Ekim 2020, ss.209
Decreasing agricultural areas is one of the sources of concern in all over the world. It is predicted in future scenarios that many strategic crops such as cotton will compete with staple crops such as wheat due to lack of agricultural areas. Furthermore, relay strip intercropping of wheat and cotton is considered as outstanding system in terms of land use productivity and it was adopted by farmers especially in China. However, it has negative effects to growth of cotton during intercropped period and it is need to be focused on mitigation of these negative effects. For this purpose, cotton growth which is suppressed by shading of wheat were examined in this study. The study was comprised of four replications and two factors. These factors were cropping systems (sole cropping and intercropping of wheat and cotton) and sowing directions (north-south and east-west). We measured leaf greenness, canopy temperature, leaf area, dry matter and photosynthetic active radiation on cotton plants in order to quantify negative effects of wheat. As results of study, growth of intercropped cottons under shade of wheat were generally diminished according to calculated growth parameters such as crop growth rate (39%) and net assimilation rate (15%). This decrease could have been triggered by change on leaf morphology. Intercropped cotton plants acclimated to low light conditions by increasing specific leaf area (33%) and its mean that leaf thickness were decreased. Additionally, after harvest of wheat, intercropped cottons were exposed to fully sunlight and specific leaf area decreased in 61%, canopy temperature depression decreased in 60% and SPAD increased in 9%. As conclusion, it was suggested that adaptation of cotton to low light conditions seemed to be related to change in leaf morphology.