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采用盆栽试验研究了水稻水作与旱作条件下土壤和植物的磷素有效性。结果表明 :施磷使两种栽培条件下的水稻吸磷量明显提高 ,水作水稻比旱作水稻从土壤中吸收的磷更多 ;施磷后水作和旱作土壤各组分磷都有所增加 ,其中以树脂P、NaHCO3 P和NaOHP较为突出。在水作条件下 ,从分蘖到成熟期水稻吸磷的增加量与树脂P、NaHCO3 P、细胞P、NaOHP的减少量有很好的相关性 ;而在旱作条件下 ,水稻吸磷的增加量仅与树脂P、NaHCO3 P的减少量相关性较好。树脂P、NaHCO3 P、细胞P、NaOHP、超声波P对水稻都具有不同程度的生物有效性
The pot experiment was conducted to study the phosphorus availability of soils and plants under paddy and dry cultivation. The results showed that phosphorus application significantly increased phosphorus uptake of rice under both cultivation conditions, while water uptake of phosphorus from soil by rice was higher than that of paddy rice. After phosphorus application, Increased, of which resin P, NaHCO3 P and NaOHP more prominent. Under water conditions, the increase of phosphorus uptake from tillering to mature rice had a good correlation with the decrease of P, NaHCO3 P, cell P and NaOHP. Under the condition of dry cultivation, the increase of phosphorus uptake The amount only correlates well with the decrease of resin P and NaHCO3 P. Resin P, NaHCO3 P, cell P, NaOHP and ultrasonic P have different degrees of bioavailability to rice