| Effects of application of different nitrogen levels on decomposition characteristics and nutrient release of returning straw |
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| DOI：10.7606/j.issn.1000-7601.2020.01.14 |
| Key Words: corn stalk decomposition nitrogen application rate nutrient release rate potato field plastic film mulching |
| Author Name | Affiliation | | CHEN Jianying | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University,Engineering Research Center of Livestock and Poultry Waste Resource Utilization in Gansu Province, Lanzhou， Gansu 730070, China | | LUO Chaoyue | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University,Engineering Research Center of Livestock and Poultry Waste Resource Utilization in Gansu Province, Lanzhou， Gansu 730070, China | | QIU Huizhen | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University,Engineering Research Center of Livestock and Poultry Waste Resource Utilization in Gansu Province, Lanzhou， Gansu 730070, China | | DENG Delei | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University,Engineering Research Center of Livestock and Poultry Waste Resource Utilization in Gansu Province, Lanzhou， Gansu 730070, China | | ZHANG Chunhong | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University,Engineering Research Center of Livestock and Poultry Waste Resource Utilization in Gansu Province, Lanzhou， Gansu 730070, China | | GUO Yajun | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University,Engineering Research Center of Livestock and Poultry Waste Resource Utilization in Gansu Province, Lanzhou， Gansu 730070, China | | ZHANG Jianbin | College of Resources and Environmental Sciences, Gansu Provincial Key Lab of Aridland Crop Science, Gansu Agricultural University,Engineering Research Center of Livestock and Poultry Waste Resource Utilization in Gansu Province, Lanzhou， Gansu 730070, China |
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| Abstract: |
| In order to determine the decomposition dynamics and nutrient release of maize straw return under different nitrogen (N) application rates, a field experiment was conducted at Dingxi County in the Gansu Province of China.The experiment had six N treatments including no-N application (0 kg·hm-2, T1), 75 kg·hm-2 (T2), 150 kg·hm-2 (T3), 225 kg·hm-2 (T4), 300 kg·hm-2 (T5), and 375 kg·hm-2 (T6) with four replications. The 42.6 g of maize straw was incorporated into each of the treatments by nylon mesh bag method. Results from the experiment revealed that maize straw decomposition occurred within the first 90 days after returning into the soil and the decomposition rate increased rapidly during this period.The decomposition rate of corn straw was 37.3%, 40.3%, 44.8%, 45.0%, 50.8%, and 48.4% in T1~T6 treatments, respectively. Treatment T5 significantly (P<0.05) achieved the highest decomposition rate throughout the decomposition period. At the same time, the release rates of C and N of maize straw in T1~T6 treatments were 48.2%~56.6% and 33.8%~44.4%, respectively. The release rates of C and N of maize straw in T5 treatment were significantly higher than those in other treatments (P<0.05).However, the release rates of P and K were 43.1%~49.2% and 90.5%~93.0%, there was no significant difference among all the treatment (P>0.05). The rate of straw decomposition after 150 days ranged from 52.7% to 55.8%, and the nutrient release was ranked as K>C>P>N. In summary, the continuous application of different nitrogen rates significantly influenced straw decomposition rate and the release of carbon and nitrogen, however the release rates of phosphorus and potassium were not statistically significant. The T5 (300 kg·hm-2) had the greatest impact on decomposition. |
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