Effects of Climate Change Critical Factors on the Seedling Growth and Development of Maize (Zea mays L.)

摘要

Crop production is highly dependent on weather and change in climate has a major effect on crop yield, and thus on food supply. The effect of critical factors for climate change on growth and development of Zea mays was investigated. The treatments used were water, temperature, light intensity and soil (pH and nutrients). Growth factors such as height, leaf area, fresh and dry weights as well as dry and fresh weight ratio were determined. An average weight of 3kg of sandy, clay, loamy and laterite (red) soils in black planting bags of 21 by 25cm were used. Single (SN) and double (DN) netted cages were constructed to reduce the amount of light absorbed by plants. The control was without net (WN) while another set without net1 (WN1) was subjected to drought (watered only once). Three replicates for each soil treatment were used, and the experiment lasted for 8 Weeks. The results revealed that seeds sown in clay and laterite soils for WN1 germinated and died after three weeks because of the drought condition. Loamy soil for SN showed the highest mean height of 125cm±0.95. Also, loamy soil (WN) had the highest values of 214.49cm2±0.35 and 92.90g±3.21 for leaf area and dry weight, respectively. Soil pH values for sandy and loamy soils were within the acceptable pH range of 6.5 – 8.5. Plants sown in loamy soil for SN, DN and WN flowered within the period of the experiment. The highest value of 1.80g weight for inflorescence was recorded for WN with loamy soil. For loamy soil, there was significant difference between all soil treatments (nutrient, temperature and light intensity) at P<0.05. Since salts (ions) absorption is through solution in the soil, water may be considered as the most critical factor for the growth and development of plants.