高寒半干旱区莜麦田施肥效应

The Effect of Fertilization for Naked Oat in SemiaridRegion with Cold and High Elevation

高寒半干旱区土壤缺氮贫磷，增施氮磷肥能显著提高莜麦产量，且氮磷间具有明显的正交互效应，氮磷配合施用有机肥是提高作物产量的有效措施。单无机肥时Ｎ，Ｐ２Ｏ５经济施用量分别为７９．２６－８６．８０ｋｇ．ｈｍ＾－２和５８．８７－６５．０９ｋｇ．ｈｍ＾－２，施有机肥２２５００ｋｇ．ｈｍ＾－２时则分别为５４．１８－５８．５０ｋｇ．ｈｍ＾－２和２７．１４－２９。．１１ｋｇ．ｈｍ＾－２。

In accordance with soil nitrogen and phosphate deficiency in semiarid region with coldand high elevation, nitrogenous fertilizer and phosphate fertilizer coupling increased notably theyield of naked oat,and there was an obvious interaction effect. The application of N, P fertilizerin combination with organic fertilizer was an effective measure of increasing crop yield. WhenN, P fertilizer applied alone, the econom ic rational N and P fertilizer rates were N = 79. 26 ~ 86. 80kg' hm - 2, P2O5 = 58. 87 ~ 65.09 kg' hm -2. When N, P fertilizer in combination with 22 500kg' hm - 2 organic fertilizer were applied, they were different, N = 54. 18 ~ 58. 50 kg' hm -2, P2O5= 27. 14 ~ 29. 11 kg. hm-2. When N, P fertilizer in combination with 22 500 kg' hm -2 organicfertilizer were applied, WU E and PU E were differently increased by3. 50 ~ 5. 08 kg' mm -1'hm -2 and 4.41 ~ 6. 88 kg' mm -1' hm -2 as compared with M0N0P0' While N, P fertilizer incombination with 45 000 kg' hm -2 organic fertilizer were applied, WU E and PUE were differently increased by 4.54 ~ 6.66 kg' mm -1. hm -2 and 6.01 ~ 8.23 kg' mm -1. hm -2 .The application of N, P fertiliter in combination with organic fertilizer was an effective way of increasingW U E and full excavating precipitation productive potential.