A new trend involving the combination of solar concentrators and agricultural plants on the same piece of land offers the possibility of realizing both electricity generation and a good crop *** analyze this situation...
详细信息
A new trend involving the combination of solar concentrators and agricultural plants on the same piece of land offers the possibility of realizing both electricity generation and a good crop *** analyze this situation for different countries,including Mexico,and based on authors’experience regarding the development of new solar concentrator prototypes,authors’primary objective was to describe the development of compact,light,and inexpensive solar concentrator prototypes that can be collocated on horizontal ***’second objective was to investigate the combination of such solar concentrator prototypes with agricultural plants on the same ***,several studies related to the combination of renewable energy generation and agricultural crops were *** such systems involving the combination of PV(Photovoltaic)panels with different types of vegetables exist in the USA,France(lettuce production),Japan(tomato production),India(aloe and corn),northern Italy(maize),Spain and México.
Phosphorus(P)is an essential element for agricultural ***-fertilization during decades caused an accumulation of P in soils leading to eutrophication in regions characterized by intensive *** environmental concerns to...
详细信息
Phosphorus(P)is an essential element for agricultural ***-fertilization during decades caused an accumulation of P in soils leading to eutrophication in regions characterized by intensive *** environmental concerns together with the non-renewability of P resources have led to a more sustainable P *** about the P need of crops is essential for a sustainable agriculture thereby minimizing P losses to the environment without lowering the yield ***,in this study,critical soil P values for yield reduction(PCrit)were determined based on fertilizer trials conducted between 1970 and 1988 and more recent fertilizer trials(2016-2017).At rotational level a common PCrit value of 109 mg P/kg dry soil(in an ammonium lactate and acetate extract)was *** specific PCrit values were also determined for seven crops(potato,winter wheat,barley,rye,maize,sugar beet and temporary grassland).These critical values ranged from 59 mg P/kg dry soil to 164 mg P/kg dry soil with winter wheat the least and maize the most sensitive towards P *** diversity in PCrit values among crops can mainly be explained by the root intensity but also rooting depth,exudation of organic acids and phosphatases may influence the PCrit *** soil pH also influenced the P availability *** with a favorable pH had a significantly higher availability(i.e.,lower PCrit value)for all crops compared to soils with a suboptimal *** soil P values might help to set up new or to evaluate current soil P in target zones used for P fertilizer recommendations.
暂无评论