It is well known the effect of fertilizer applications in Haplic Luvisols after crop production, but long term changes in precipitation and soil organic carbon are not well documented. Study aimed to determine the eff...It is well known the effect of fertilizer applications in Haplic Luvisols after crop production, but long term changes in precipitation and soil organic carbon are not well documented. Study aimed to determine the effect of precipitation and fertilization （NPKCaMg） on the changes in soil organic carbon （SOC） in a long-term field experiment set up in Nyirlugos （Nyirs6g region, Hungary： N： 47°41′60″ and E： 22°2′80″ since 1962） on a Haplic Luvisol. Over the 40 year period, from 1962 to 2002, SOC pool values ranged between 2.32 and 3.36 mg kg-1. On the untreated control plots the values remained nearly constant （3.31 mg kg-1, ± 0.29 mg kg1 and 0.52 mg kg-1）. NPKCaMg fertilization resulted in a significant （P 〈 0.001） decline （16.6%） in SOC in comparison to the control plots in the Ist 20-year interval, while in the 2nd 20-year period a significant （P 〈 0.001） increased （up to 31.9%） was noticed. During the 40 experimental years the seasonal correlations （R2 among SOC （mg kgl）, WHY and SHY precipitation （mm） ranged from 0.3343 to 0.9078 （on the P 〈 0.001 significance level）. The correlations （R2） on the influence of NPKCaMg fertilization on SOC （mg kg-1） and precipitation （mm） were significant （P 〈 0.001）： the means for WHY, SHY and over the 40 years were 0.4691, 0.6171 and 0.6582, respectively. Organic carbon reserves （mg kg-1） in soils decreased linearly as precipitation increased （from 3.22 to 7.27 mm yr-1）. In case this trend-increasing precipitation caused by climate change reduces SOC in arable soils-will continue, and is aggravated by warming temperatures and a more altering climate （as predicted by climate change forecasts）, the livelihoods of many Hungarian and European farmers may be substantially altered.展开更多
The efficacy and reliability to use humic substances for increasing crop yields have not been widely established in the scientific literature. The aim of the research isto increase pomegranate cutting survival rate an...The efficacy and reliability to use humic substances for increasing crop yields have not been widely established in the scientific literature. The aim of the research isto increase pomegranate cutting survival rate and the number of quality saplings in nursery production through humic and fulvic acid application during the growing period. The application of humic substances in the pomegranate nursery resulted in a significant positive effect for the quality of the sapling increasing both diameter and height. The data about yield indicates that reducing fertilizer use is balanced by the humic acid through the increase of nutrient uptake by the plant. It also showed that organic matter decomposition and the mineralization processes in the soil increases. The humic substances also tend to regulate soil pH and soil salinity and help to retain organic matter in the surface layer, meanwhile the salt content is leaching out from the surface layer accumulating in the layers below.展开更多
文摘It is well known the effect of fertilizer applications in Haplic Luvisols after crop production, but long term changes in precipitation and soil organic carbon are not well documented. Study aimed to determine the effect of precipitation and fertilization （NPKCaMg） on the changes in soil organic carbon （SOC） in a long-term field experiment set up in Nyirlugos （Nyirs6g region, Hungary： N： 47°41′60″ and E： 22°2′80″ since 1962） on a Haplic Luvisol. Over the 40 year period, from 1962 to 2002, SOC pool values ranged between 2.32 and 3.36 mg kg-1. On the untreated control plots the values remained nearly constant （3.31 mg kg-1, ± 0.29 mg kg1 and 0.52 mg kg-1）. NPKCaMg fertilization resulted in a significant （P 〈 0.001） decline （16.6%） in SOC in comparison to the control plots in the Ist 20-year interval, while in the 2nd 20-year period a significant （P 〈 0.001） increased （up to 31.9%） was noticed. During the 40 experimental years the seasonal correlations （R2 among SOC （mg kgl）, WHY and SHY precipitation （mm） ranged from 0.3343 to 0.9078 （on the P 〈 0.001 significance level）. The correlations （R2） on the influence of NPKCaMg fertilization on SOC （mg kg-1） and precipitation （mm） were significant （P 〈 0.001）： the means for WHY, SHY and over the 40 years were 0.4691, 0.6171 and 0.6582, respectively. Organic carbon reserves （mg kg-1） in soils decreased linearly as precipitation increased （from 3.22 to 7.27 mm yr-1）. In case this trend-increasing precipitation caused by climate change reduces SOC in arable soils-will continue, and is aggravated by warming temperatures and a more altering climate （as predicted by climate change forecasts）, the livelihoods of many Hungarian and European farmers may be substantially altered.
文摘The efficacy and reliability to use humic substances for increasing crop yields have not been widely established in the scientific literature. The aim of the research isto increase pomegranate cutting survival rate and the number of quality saplings in nursery production through humic and fulvic acid application during the growing period. The application of humic substances in the pomegranate nursery resulted in a significant positive effect for the quality of the sapling increasing both diameter and height. The data about yield indicates that reducing fertilizer use is balanced by the humic acid through the increase of nutrient uptake by the plant. It also showed that organic matter decomposition and the mineralization processes in the soil increases. The humic substances also tend to regulate soil pH and soil salinity and help to retain organic matter in the surface layer, meanwhile the salt content is leaching out from the surface layer accumulating in the layers below.
