| Effects of partial substitution of chemical fertilizer by bio\|organic fertilizer on the growth, yield and quality of asparagus lettuce |
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| DOI：10.7606/j.issn.1000-7601.2020.01.09 |
| Key Words: asparagus lettuce reduce fertilizer application bio\|organic fertilizer growth quality yield fertilizer contribution rate |
| Author Name | Affiliation | | ZHANG Yingchun | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | XIE Jianming | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | YU Jihua | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | TANG Chaonan | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | WANG Cheng | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In order to improve the situations of the excessive application of chemical fertilizers resulting inreduced vegetable quality, low fertilizer utilization rate, environmental pollution, and so on, a field experiment was carried out using combined application of bio\|fertilizer with chemical fertilizer to explore the potential of it in vegetable fields and the effect of bio\|organic fertilizer, and provide a scientific basis for reasonable fertilization.In this study, asparagus lettuce field experiment was conducted to investigate the effects on yield, quality, photosynthesis, and fertilizer contribution rate under different combinations. Six treatments were as follows: non\|fertilization (CK1), 100% chemical fertilizer (CK2), 80% chemical fertilizer with 200 kg·667m-2 bio\|organic fertilizer (T1), 80% chemical fertilizer with 400 kg·667m-2 bio\|organic fertilizer (T2), 70% chemical fertilizer with 400 kg·667m-2 bio\|organic fertilizer (T3), 70% chemical fertilizer with 200 kg·667m-2 bio\|organic fertilizer (T4). The results revealed that the combined application of bio\|fertilizer with chemical fertilizer treatments increased in different degrees the plant height, stem height, and stem diameter of asparagus lettuce in comparison with CK2, and T2 was the most significant. Compared with 30% reduction of chemical fertilizer (T3 and T4) treatments, the 20% reduction of chemical fertilizer (T1 and T2) treatments significant increases root growth and root vitality under the same conditions. The content of photosynthetic pigments with T2 treatment increased by 17.32 and 1.74% compared to CK1 and CK2, respectively. In addition, the net photosynthetic rate and transpiration rate in asparagus lettuce treated with T2 treatment were the highest, with increased degree ranging from 6.90%~9.35% and 6.26%~58.64%, respectively. Compared with CK2, the yield of T1, T2, T3, and T4 increased by 4.76%, 15.31%, 11.06%, and 4.11%, respectively. And the yield of T2 was the highest at 8 277.00 kg·667m-2, and its economic benefit was 11.64% higher than that of CK2. The supply of 100% chemical fertilizer exceeded the crop demand, and the balance of supply and demand was broken, which leaded to waste of fertilizer. The contribution rate of fertilizer was significantly improved by combined application of bio\|fertilizer with chemical fertilizer. The content of nitrate in stem and leaf decreased with decrease in chemical fertilizer usage. Additionally, the contents of soluble protein, soluble sugar, and vitamin C increased with applying biological organic fertilizer. Therefore, the 80% of conventional chemical fertilizer with 400 kg·667m-2 bio\|organic fertilizer progress of photosynthetic capacity, improved yield and quality in asparagus lettuce, which was a good fertilization mode to realize the rational allocation of fertilizer resources. |
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