草业学报2019，Vol.28Issue(1)：37-49,13.DOI:10.11686/cyxb2018069
基于响应面设计的饲草型小黑麦新品系C31栽培条件优化筛选
Optimal cultivation conditions for forage triticale line C31, based on a response surface experiment
摘要
Abstract
In order to identify the optimal cultivation conditions for forage triticale (Triticale wittmack) line C31, the effects of plant density, nitrogen fertilizer rate, and rainfall on hay yield and nutritional quality of triticale line C31 grown for forage, were studied.A regression prediction model for hay yield and nutritional quality of triticale line C31 was established based on the response surface method, which included 3factors (plant density, nitrogen fertilizer rate, rainfall) and 5levels.Key results were:1) The 3factors (plant density, nitrogen fertilizing rate, rainfall) all significantly affected the hay yield and nutritional quality of forage triticale (P＜0.05).The interaction between rainfall and nitrogen fertilizer rate was significant for hay yield (P＜0.05), while the interaction between rainfall and triticale plant density was significant for triticale nutritional quality (P＜0.05).2) In the multiple quadratic regression analysis, all 3factors were shown to have highly significant effects on hay yield and nutritional quality of triticale (P＜0.01), the results show that the regression model of hay yield and nutrient quality can represent the actual hay yield and nutrient quality of forage triticale.3) Forage triticale line C31 was found to be suitable for growing in Hezuo, where the rainfall varied from 318mm to 325 mm during the growth period of triticale.4) Triticale line C31 was predicted to have the highest hay yield and nutritional quality when the rainfall was 322.07mm during the growth period of triticale.At this predicted optimum rainfall, the nitrogen fertilizer rate indicated by the model was 289.17kg N·ha-1, and modelled optimal plant density of triticale was 5.79 million seedlings·ha-1.Under these conditions the model predicted hay yield and nutritional quality of 16732.50kg·ha-1 and 0.71, respectively.This study demonstrates a simple and effective method for evaluating the hay yield and nutritional quality of triticale germplasm under different growing conditions and suitable planting locations.关键词
小黑麦/降水量/氮肥施用量/种植密度/干草产量/营养品质Key words
triticale/rainfall/nitrogen fertilizing rate/plant density/hay yield/nutritional quality引用本文复制引用
刘晶,曲广鹏,田新会,杜文华..基于响应面设计的饲草型小黑麦新品系C31栽培条件优化筛选[J].草业学报,2019,28(1):37-49,13.基金项目
甘肃省草地畜牧业可持续发展创新团队项目(2017C-11),国家自然基金(31760702)和国家重点研发计划(2018YFD0502402-3)资助 （2017C-11）
