Effects of fertilizer and humectants to growth plant Casuarina equisetifolia Forst. Et Forst.f in the sime - fixed sandy dunes in Le Thuy and Trieu Phong district

Abstract

Casuarina equisetifolia Forst. Et Forst. F a multi - purpose tree species,
suitable for protection of sandy coastal areas, windbreaking effect, shifting sand control, protection of rice fields, villages, and livelihoods of coastal people. Research results show that application of 300 g of Song Gianh microorganic organic fertilizer in the first 3 years of incorporation of 10 g humectant/tree for Casuarina equisetifolia in semi - fixed sandy dunes was significantly effective after 24 months of age. The average growth rate in the experimental formulas ranged from ΔDoo = 0.79 to 1.10 cm/yr, ΔHvn = 0.35 -0.45 m/yr (Le Thuy) and ΔDoo = 0.92 - 1.02 cm/yr, ΔHvn = 0.67 - 0.70 m/yr (Trieu Phong). Survival rate ranged from 65.2% (ĐC) to 77.8% (CT3 - Le Thuy) and from 60.6% (ĐC) to 75.8% (CT3 - Trieu Phong). The percentage of dead tops of the trees ranged from 50.0 - 82.8% (Trieu Phong) to 39.4 - 85.4% (Le Thuy). The results from this study as the basis initially for microorganic organic fertilizer with humectants applied in the afforestation of coastal sandy areas, especially on the fixed sandy dunes, semi - fixed sandy dunes in coastal sandy regions of North Central provinces.