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Study on Agronomic Traits and Nutritional Quality of Poa Forages in Response to Water Deficit
AYun, CHENCaijin, TANYuchen, TONGJianfu, SUXiaohan, LIUHuixiang, ZHUYongming, HUANGDanni
Chin Agric Sci Bull ›› 2026, Vol. 42 ›› Issue (16) : 200-208.
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Abbreviation (ISO4): Chin Agric Sci Bull
Editor in chief: Yulong YIN
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Study on Agronomic Traits and Nutritional Quality of Poa Forages in Response to Water Deficit
To elucidate the dynamic changes in agronomic traits and nutritional quality of Poa forage under water deficit conditions, 3 native germplasms, namely Poa pratensis, Poa pratensis var. anceps Gaud. cv., Poa crymophila, were used as experimental materials. 3 soil moisture levels were established, including 60% (control), 45% (moderate water stress) and 30% (severe water stress). The growth performance, nutritional quality and drought resistance of the tested materials were investigated systematically. The results showed that: (1) with the intensification of water deficit, the fresh weight, dry weight, plant height, relative water content (RWC), crude protein (CP), ether extract (EE) and relative feed value (RFV) of 3 forage varieties decreased significantly by 1.97%-34.93% (P<0.05); the contents of neutral detergent fiber (NDF) and acid detergent fiber (ADF) increased significantly by 4.61%-13.58%; (2) two-factor analysis showed that the agronomic and quality indicators of forages were jointly affected by genotype and water stress, and these indicators were more sensitive to water deficit; (3) grey correlation degree evaluation indicated that the drought resistance and production performance were ranked as follows: P. pratensis>Poa pratensis var. anceps Gaud. cv.>P. crymophila; (4) path analysis revealed that the direct effects on dry weight were ranked in the order: fresh weight>RWC>plant height>CP>RFV>EE>Ash>NDF>ADF. Among them, fresh weight, RWC, plant height and CP exerted major positive effects. In conclusion, P. pratensis is suitable for popularization in arid and semi-arid regions because of its good growth, stable yield, superior quality and strong drought resistance under water deficit conditions, and can serve as an excellent germplasm resource for artificial grassland establishment and degraded grassland restoration.
Poa / water deficit / production performance / nutritional quality / grey correlation evaluation
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Nutrient deficiency in food crops is seriously affecting human health, especially those in the rural areas, and nanotechnology may become the most sustainable approach to alleviating this challenge. There are several ways of fortifying the nutrients in food such as dietary diversification, use of drugs and industrial fortification. However, the affordability and sustainability of these methods have not been completely achieved. Plants absorb nutrients from fertilizers, but most conventional fertilizers have low nutrient use and uptake efficiency. Nanofertilizers are, therefore, engineered to be target oriented and not easily lost. This review surveys the effects of the addition of macro- and nanonutrients to soil, the interaction, and the absorption capability of the plants, the environmental effect and food content of the nutrients. Most reports were obtained from recent works, and they show that plants nutrients could be enriched by applying nanoparticulate nutrients, which are easily absorbed by the plant. Although there are some toxicity issues associated with the use of nanoparticles in crop, biologically synthesized nanoparticles may be preferred for agricultural purposes. This would circumvent the concerns associated with toxicity, in addition to being pollution free. This report, therefore, offers more understanding on the application of nanotechnology in biofortification of plant nutrients and the future possibilities offered by this practice. It also highlights some of the ills associated with the introduction of nanomaterials into the soil for crop’s improvement.
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