Increasingly, poor soils are used for plant cultivation involving chemical fertilizer (CF) usage which in turn lowers soil quality. To improve the quality of poor soils, promote plant growth, and reduce CF use, bio-organic-mineral fertilizer (BF) was introduced to poor soil to examine its effects on both soil and plants. Organic fertilizer (OF), CF, and mineral powder (MP) were applied as controls. When cotreating water spinach with fertilizer, the soil quality was improved with the increased doses of BF, OF, and MP. The BF treatment produced the most pronounced improvement. Applying CF reduced the soil quality. Under the CF treatment the largest plant-growth-promoting effect was observed within 30 d, whereas plants treated with BF showed the most favorable growth after 50 d. Moreover, for BF, plants' nutritional quality was also higher, particularly in the long term. When poor soil was treated with fertilizer without plants, the soil quality changed as in the previous treatment; however, the change in this treatment was more pronounced and the remaining available elements in soil were higher, particularly in the case of CF treatment. These results indicate that BF treatment without CF can be applied to improve the quality of poor soil, and meanwhile promote plant growth and quality.Résumé : On cultive les plantes sur des sols de plus en plus pauvres au moyen d'engrais chimiques (EC) qui détériorent la qualité du sol. Pour rehausser cette dernière, faire croître les plantes plus vite et réduire l'usage des EC, les auteurs ont ajouté un engrais bio-organique minéral (EB) à un sol appauvri afin d'en examiner les effets sur le sol et les végétaux. Un engrais organique (EO), un EC et de la poudre minérale (PM) ont servi de traitements témoins. Quand on fertilise l'épinard d'eau avec un engrais, la qualité du sol s'améliore avec les doses croissantes d'EB, d'EO et de PM. L'amélioration la plus marquée dérive de l'usage d'EB. L'application d'EC diminue la qualité du sol. La plus forte accélération de croissance a été observée avec l'EC après 30 jours, l'application d'EB entraînant la meilleure croissance après 50 jours. D'autre part, l'EB assure une nutrition de meilleure qualité aux plantes, surtout à longue échéance. Quand on amende le sol appauvri sans le cultiver, sa qualité change, comme avec le traitement précédent, mais le changement est plus prononcé, surtout quand on utilise un EC comme amendement. La concentration d'oligoéléments disponibles qui subsiste dans le sol est aussi plus élevée. Ces résultats indiquent qu'on pourrait se servir d'EB sans EC pour rehausser la qualité des sols appauvris, avec des effets bénéfiques pour la croissance des plantes et leur qualité. (Traduit par la Rédaction) Mots-clés : engrais bio-organique minéral, sol appauvri, amélioration de la qualité, Ipomoea aquatica, croissance, engrais chimique.
Portulaca granulatostellulata and P. edulisare two subspecies ofcommon purslane. The biomass of both plants was similar; however, with long upright stems and a long vegetative period, P. edulis production was easier. Both subspecies were rich in vitamin C and flavonoids, main organic nutrients' contents in 25-d-old plants were higher than those in15-d-old plants, and were higher in P. granulatostellulata. Both purslanes were rich in minerals, with the K content being the highest, and was higher in P. edulis, whereas the Ca content was higher in P. granulatostellulata. A similarly high content of polyunsaturated fatty acid, particularly α-linolenic acid, in both purslanes showed their high value in balancing the ω-6/ω-3 intake ratio. Furthermore, all the contents of nitrate and heavy metals in this study were within the safe range, and the oxalic acid content in mature plants decreased to the high level of oxalic acid in vegetables. In brief, both purslanes are excellent reserve crops for use as vegetables and medicines. P. edulis has advantages over P. granulatostellulata regarding plant appearance and the K content. P. granulatostellulata has advantages regarding Vc, flavonoid and other mineral contents; Both purslanes are similar in fatty acid composition and are suitable for picking at a mature stage.
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