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The Effects of Water Regimes on Morphological and Physiological Traits of Black Pepper (Piper nigrum)

Long Nguyen Viet, Phommalueza Dokmai, Minh Luong Nhat, Phan Thi Hong Nhung, Ha Chu Duc, Van Loc Nguyen

Journal of Ecological Engineering

2024

Vol. 25, nr 11

327--334

This research investigates the impact of drought and waterlogging stresses on the morphological and physiological characteristics of black pepper (Piper nigrum). The greenhouse experiment was laid out in a randomized complete block design (RCBD) with treatments consisting of three water regimes (drought, control, and waterlogging), all replicated three times. The results suggested that the root traits of black pepper, such as root length and surface area, showed considerable reductions under both stress conditions, with more severe impacts observed under waterlogging. The significant reductions were observed in plant height, number of leaves, number of branches, leaf area, and SPAD value, root and shoot dry weight of black pepper. Gas exchange parameters also decreased markedly under drought stress, with waterlogging causing an even greater reduction. The findings provide valuable insights into managing the effects of environmental fluctuations on black pepper cultivation.

Sandy Soil Reclamation Using Biochar and Clay-Rich Soil

Thi Diep Pham, Hang Nga Nguyen Thi, Viet On Tran, Van Loc Nguyen, Viet Anh Nguyen, Lan Phuong Dinh Thi, Van Nguyen Vu

Journal of Ecological Engineering

2021

Vol. 22, nr 6

26--35

The investigations on the effects of biochar application in improving the physio-chemical properties of soil have been carried out in many studies; however, there are very few studies on the combined use of both biochar and clay-rich soil for poor nutrient soil reclamation. Therefore, this study demonstrates improved water retention and nutrient retention of sandy soil by using biochar and biochar combined with clay-rich soil. The experiments were conducted on a small scale (greenhouse) with nine different application rates of biochar and clay-rich soil were mixed and then cultivated peanut, along with the drip irrigation technique using field moisture limit (about 70-80%) was applied under the condition of ensuring a sufficient supply of NPK for plant’s growth. The results showed that at the rates from 10.0-15.0% (w/w) clay-rich soil mixed with from 0.5-1.5% (w/w) of biochar applied to the tested sandy soil resulted in the positive effects on soil water holding, bulk density, permeability, pH, CEC, OM, total N, total P and peanut yield. The physical and chemical characteristics of the tested sandy soil have been improved by time and the application rate of 10.0% clay-rich soil and 0.5% biochar had the highest efficiency of pod fresh weight and pod dry weight during three studied seasons.