By K. R. Krishna
This e-book is a finished quantity that brings jointly great wisdom approximately agricultural prairies in a single position, offering concise info and delivering concise descriptions of typical assets and their impression on crop productiveness. It offers unique descriptions approximately normal settings in addition to lucid discussions on soil fertility and crop creation tendencies for varied agricultural prairies disbursed all around the earth.
Chapters one via seven supply targeted descriptions on geologic points; physiography and agroclimate; normal crops and cropping historical past; human inhabitants, migration and improvement of settlements; ordinary assets corresponding to soils, water, and vegetation; and environmental matters. specifically, the 1st chapters disguise the prairies of North and South the USA, particularly, the good Plains of North the US, the Cerrado of South the US, and the Pampas of South the US. bankruptcy four offers with the steppes of Southern and relevant Europe, bankruptcy five describes the savannahs of West Africa, bankruptcy 6 is anxious with Indo-Gangetic and Deccan plainsm, and bankruptcy 7 bargains with prairies of Northeast China.
The final bankruptcy presents a comparative view of all agricultural prairies. in particular, it compares the contrasting ordinary positive factors, soil fertility, irrigation, and crop productiveness. Agricultural prairies exist at degrees of intensification. a number of express subsistence or low enter tendencies. Discussions referring to volume of intensification are incorporated. additional, it comprises attention-grabbing discussions on how the location has grown into interdependence of guy and prairies. It highlights the way in which prairies (crops) have encouraged, obviously coaxed, and pushed human actions to their very own virtue.
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Additional info for Agricultural prairies : natural resources and crop productivity
Example text
Farmers gained in terms of reduction in loss of surface soil and moisture, whenever they practiced no-tillage systems. Soil tillage systems adopted through the ages had its own impact on soil structure, soil fertility, moisture holding capacity, crop growth, and productivity. Tillage, especially, conservation tillage or no-tillage systems has been effectively used during past two decades to thwart loss of soil fertility and quality. Land surface management techniques, such as flat-bed formation, ridges-furrows, and broad bedfurrow, too have been utilized to manage soil fertility.
Clearly, supply of fertilizer-N at appropriate quantities, addition of nitrification inhibitors, and timing them accurately is important in the semiarid cropping zones. Tremblay et al. (2012) have made detailed analysis of influence of soil properties, especially texture, water holding capacity, soil-N content, and their interactions with yearly weather pattern on crop yield in the Central Great Plains. They have pointed that most recent computer-based crop growth models and recommendations do not consider effects of weather and soil properties, while deciding on fertilizer-N supply.
The extent of biomass response depended on forage species. For example, response of wheat grass, smooth brome grass, crested wheat grass, and Russian wild rye responded with marginal increase in biomass. Generally, supply of fertilizer-N has enhanced protein content of forage grass, and has also allowed accumulation NO3-N in soil. Excessive supply of fertilizer-N needs to be curtailed, since it is prone to loss via seepage and percolation. Schlegel et al. (2005) opine that cropping systems practiced in the Great Plains has gradually changed from cereal-fallow to intensification and diversified crop sequences.