Study On Effects Of Balance Fertilization On Productivity Of Old Elymus Sibirilus L.cv. And The Soil Nutrition

Abstract: Fertilizer application is one of important treatments to improve productivity of grassland. Effects of balance fertilizer application on old Elymus sibirlius L.cv. Productivity were studied in the field. It was proved that either applied potassium fertilizer on the basic of applying nitrogen fertilizer or applied phosphorus fertilizer on the basic of applying the mixtures of nitrogen fertilizer and potassium fertilizer, that all increased the above and underground biomass, seed yield, CP content and EE content in the seed and foliage. The two ways of fertilizer application decreased the content of soil DM and increased the content of soil salty. Fertilization of suitable potassium (37.5kg/hm2) increased the weight of root underground ocm-25cm. And it mainly increased the weight of root underground 5cm-20cm. The weight of root underground 0-25cm in the area of 5×10cm was significantly increased with applied potassium fertilizer by 150kg/hm2. Applying potassium fertilizer increased the NDF content n foliage and seed of old Elymus sibirilus L.cv.. While the ADF content had a tiny change Potassium fertilizer increased the phosphorus content n seed of old Elymus sibirilus L.cv.. But the phosphorus content in foliage dwindled. Phosphorus fertilizer application made the NDF content and ADF content in the seed of old Elymus sibirilus L.cv. up but made the ADF content down in the foliage, while the NDF content increased. And the phosphorus content in the seed had no effect. The phosphorus content in the foliage was decreased while the Ca contentment was significantly increased.