Studying on potassium nutrient balance for sugarcane in lam son sugarcane belt thanh hoa province

<p> The results in Table 3:24 shows: - Growth: due to weather conditions in winter season 2011 - 2012 are prolonged drought and cold weather, which have affected the germinative situation: Cane germinates slow, germinative time is prolonged, and germinative rate is low (aveerage reached only 50 %). Compared with the control formula, germination, tillering coefficient, density of trees sprouting end, end of tillering in sugarcane formulas have higher test: germination rate reached 53.1 % (higher than 5.04 %), tillering coefficient is 1.45 times (0.13 times higher) result in that a density of tillering tree finished up 16.8 % (1.24 plant/m2). The cause of this difference is that the quiz of sugarcane planting foliage was effective in keeping heat, moisture retention for soil in low temperatures and low air humidity condition, so promoting the germination of sugarcane, tillering, increased tree density. - The components of cane yield and productivity: the growth indicators increased, resulting in yield components and cane yield of test formula increased compare with the control formula. Height of sugarcane while harvest in test formula is 298 cm (up 11.6%), 0.15 cm diameter (up 5.6%), tree volume of 0.09 kg/tree (an increase of 8,0%), tree density 6.26 plant/m2 (up 6.7%), cane yield reached 69.76 tons/ha (an increase of 9.8%, corresponding to 6.22 tonnes/ha) , compared with the control formula, respectively . - The quality indicators, sugar content and sugar yield : compared with the control formula , criteria and quality of cane sugar in the recipe testing high rise : dry matter content (Brix) increased 3.03 degrees, the sugar -rich (Pol) increased 1.26 degrees, the purity of cane juice (AP) at 88.12 % (up 5.85 %), reducing sugar content decreased by 0.09 %, CCS sugar reached 11.97, an increase of 13.8 % (1.65 CCS) . Yield and quality of sugar cane, especially CCS is higher in test formula lead to increasing sugar yield, reaching 8.35 tons / ha, an increase % (ton/ha) compared to the control formulas. Summary: The specifications of the cane in the sustainable management model of K nutrients are reached higher than current fertilizing techniques and achieve productivity goals. This is the basis of efforts to assess the feasibility and practicality of the technical model. </p>