Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province

Hefei, China

Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province

Hefei, China
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Guo Z.,Anhui Academy of Agricultural Sciences | Guo Z.,Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province | Guo X.,Anhui Academy of Agricultural Sciences | Guo X.,Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province | And 4 more authors.
Plant, Soil and Environment | Year: 2013

To investigate the effect of low soil pH caused by fertilization on soil available zinc in calcareous soil, this study was conducted based on a long-term experiment consisting of: (a) no fertilization (CT); (b) mineral fertilizer application coupled with 7500 kg/ha of wheat straw (WS-NPK); (c) mineral fertilizer application coupled with 3750 kg/ha of wheat straw (1/2WS-NPK); (d) mineral fertilizer application alone (NPK). Long-term fertilization results in a significant increase in soil DTPA-extractable zinc. However, the increased soil DTPA-extractable zinc is unavailable to crops and mainly confined to 0.25 mm > and 0.25 mm to 1 mm aggregates. Compared to CT, soil DTPA-extractable zinc under fertilization is more than 9.67% and 122.36% higher in 0.25 mm > and 0.25 mm to 1 mm aggregates, respectively. Furthermore, plant-available zinc in the 0-15 cm soil layer and wheat grain zinc are both significantly positive related to soil DTPA-extractable zinc in > 2 mm aggregates. Therefore, plant-available zinc in the 0-15 cm layer is closely associated with DTPA-extractable zinc in > 2 mm aggregates, and the low soil pH caused by long-term fertilization could not enhance plant-available zinc in the surface soil layer nor elevate wheat grain zinc concentration because of the occlusive effect of soil aggregates.


Guo Z.,Anhui Academy of Agricultural Sciences | Guo Z.,Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province | Wang D.-Z.,Anhui Academy of Agricultural Sciences | Wang D.-Z.,Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province
Plant, Soil and Environment | Year: 2013

To investigate the effects of returning wheat straw to croplands on soil compaction and nutrient availability, this trial was designed: (1) planted crops without fertilization (NF); (2) natural land without human activities (CT); (3) applied mineral fertilizers in combination with 7500 kg/ha wheat straw (WS-NPK); (4) applied mineral fertilizers in combination with 3750 kg/ha wheat straw (1/2WS-NPK); and (5) applied mineral fertilizers alone (NPK). It is found that, compared with NPK, the soil bulk density in 1/2WS-NPK and WS-NPK both decreased by more than 10% in the 0 cm to 15 cm layer, and by 6.93% and 9.14% in the 15 cm to 20 cm, respectively. Furthermore, in contrast to NPK, the soil available nitrogen in the 0 cm to 25 cm layer in 1/2WS-NPK and WS-NPK were higher by 17.43% and 35.19%, and the soil available potassium were higher by 7.66% and 17.47%, respectively. For soil available phosphorus in the depth of 5 cm to 25 cm, it was higher by 18.51% in 1/2WS-NPK and by 56.97% in WS-NPK, respectively. Therefore, returning wheat straw to croplands effectively improves soil compaction and nutrients availability, and the improvement in soil nitrogen and phosphorus availability is closely related to the amount of wheat straw.


Guo Z.,Anhui Academy of Agricultural Sciences | Guo Z.,Key Laboratory of Nutrient Cycling and Resources Environment of AnHui province | Hua K.,Anhui Academy of Agricultural Sciences | Hua K.,Key Laboratory of Nutrient Cycling and Resources Environment of AnHui province | And 8 more authors.
Spanish Journal of Agricultural Research | Year: 2014

To explore the effects of different fertilization regimes on soil organic matter (SOM) sequestration in a winter-soybean/ corn rotation, a long-term field experiment was conducted in Anhui, China, from 1982 to 2011. There were six treatments, as follows: (1) no fertilizer input (CK); (2) mineral fertilizers input (NPK); (3) mineral fertilizers + 3,750 kg ha-1 wheat straw (WS/2-NPK); (4) mineral fertilizers + 7,500 kg ha-1 wheat straw (WS-NPK); (5) mineral fertilizers + 15,000 kg ha-1 composted farmyard manure (CNPK); and (6) mineral fertilizers + 30,000 kg ha-1 composted farmyard manure (DNPK). Mineral fertilizer applications combined with organic amendments improved soil physical properties. For the WS/2-NPK, WS-NPK, CNPK and DNPK treatments, the soil bulk density decreased more than 10%, while the air porosity and field water content increased more than 90% and 15%, compared with the values at the start of the experiment in 1982. Our results indicate that about two decades are needed for SOM to reach its saturation point in all treatments. The SOM sequestration rate was related to the fertilization regime. The average SOM sequestration rate in 1982-2005 was 0.27 g kg-1 yr-1 with NPK, 0.45 g kg-1 yr-1 with WS/2-NPK, 0.56 g kg-1 yr-1 with WS-NPK, 0.60 g kg-1 yr-1 with CNPK and 1.02 g kg-1 yr-1 with DNPK. Therefore, both the quantity and the quality of the organic amendment determine the SOM sequestration rate and SOM saturation level.

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