Soil P status, inorganic P fractions, and P sorption properties were studiedusing sandy fluvo-aquic horticultural soils, which are high in organic matter content for vegetableproduction in comparison with a soil used ...Soil P status, inorganic P fractions, and P sorption properties were studiedusing sandy fluvo-aquic horticultural soils, which are high in organic matter content for vegetableproduction in comparison with a soil used for grain crop production in Zhengzhou, Henan Province,China P fractions, Olsen-P, and OM were determined at different depths in the soil profile andsorption isotherm experiments were performed Most P in excess of plant requirements accumulated inthe topsoil and decreased with soildepth. Total P, inorganic P, and OM concentrations increased withcontinued horticultural use Olsen-P concentrations in the 0-20 cm depth of horticultural soils were9 to 25 times higher than those of the grain crop soil. A linear transformation of the Langmuirequation showed that the P adsorption maximum (491.3 mg P kg^(-1)) and the maximum phosphatebuffering capacity (162.1 L kg^(-1)) for 80--100 cm were greater in the grain crop soil than thehorticultural soils. Thus, the most immediate concern with excess P were in areas where heavy Pfertilizer was used for vegetable crops and where soil P sorption capacities were low due to sandysoils and high organic matter content.展开更多
针对黔南州三都县蔬菜产区土地利用率不高,种植模式单一,周年生产效益不高等问题,通过蔬菜品种合理搭配、茬口精准安排、配套高效种植技术等措施,建立以菜—稻—菜周年高效生产接茬模式。结果表明,在椒(椒套菜)—稻—菜、番茄套菜—稻...针对黔南州三都县蔬菜产区土地利用率不高,种植模式单一,周年生产效益不高等问题,通过蔬菜品种合理搭配、茬口精准安排、配套高效种植技术等措施,建立以菜—稻—菜周年高效生产接茬模式。结果表明,在椒(椒套菜)—稻—菜、番茄套菜—稻—菜、椒(椒套菜)—菜—菜、茄子套菜—再生茄子—菜等1 a 3季4熟的5套技术模式中,筛选出早春辣椒套香葱—水稻—花菜、早春辣椒套香葱—豇豆—大白菜、茄子套大白菜—再生茄子—花菜等周年高效生产接茬模式,可对应在菜稻轮作坝区、设施大棚等产区应用,每667 m^(2)产值达2万元及以上,为中低海拔类生态区域蔬菜生产提供技术参考。展开更多
基金Project supported by the National Natural Science Foundation of China (Nos. 40071053 and 40078055).
文摘Soil P status, inorganic P fractions, and P sorption properties were studiedusing sandy fluvo-aquic horticultural soils, which are high in organic matter content for vegetableproduction in comparison with a soil used for grain crop production in Zhengzhou, Henan Province,China P fractions, Olsen-P, and OM were determined at different depths in the soil profile andsorption isotherm experiments were performed Most P in excess of plant requirements accumulated inthe topsoil and decreased with soildepth. Total P, inorganic P, and OM concentrations increased withcontinued horticultural use Olsen-P concentrations in the 0-20 cm depth of horticultural soils were9 to 25 times higher than those of the grain crop soil. A linear transformation of the Langmuirequation showed that the P adsorption maximum (491.3 mg P kg^(-1)) and the maximum phosphatebuffering capacity (162.1 L kg^(-1)) for 80--100 cm were greater in the grain crop soil than thehorticultural soils. Thus, the most immediate concern with excess P were in areas where heavy Pfertilizer was used for vegetable crops and where soil P sorption capacities were low due to sandysoils and high organic matter content.
文摘针对黔南州三都县蔬菜产区土地利用率不高,种植模式单一,周年生产效益不高等问题,通过蔬菜品种合理搭配、茬口精准安排、配套高效种植技术等措施,建立以菜—稻—菜周年高效生产接茬模式。结果表明,在椒(椒套菜)—稻—菜、番茄套菜—稻—菜、椒(椒套菜)—菜—菜、茄子套菜—再生茄子—菜等1 a 3季4熟的5套技术模式中,筛选出早春辣椒套香葱—水稻—花菜、早春辣椒套香葱—豇豆—大白菜、茄子套大白菜—再生茄子—花菜等周年高效生产接茬模式,可对应在菜稻轮作坝区、设施大棚等产区应用,每667 m^(2)产值达2万元及以上,为中低海拔类生态区域蔬菜生产提供技术参考。
