CAJ | 학술논문

苜蓿（Medicago sativa）质量是影响苜蓿干草价格的重要因素,而适时收获是把握苜蓿干草质量的重要环节。在科学种植管理条件下,对田间苜蓿质量提前判断,对准确收获目标质量苜蓿干草、保证经济效益意义重大。苜蓿产业较为发达的美国常用GDD和PEAQ法来预测田间苜蓿质量,以判断春季苜蓿的收获时间。当GDD为700～750时（5℃以上积温）,苜蓿的NDF含量接近40%,当GDD增加220（7d后）,NDF含量达到45%;PEAQ法中指出,NDF和ADF含量可以通过在具有随机样方中茎秆最高植株的茎长测量和判断样方中最成熟植株的成熟度来预测。GDD和PEAQ法对杂草较少、长势健康的苜蓿田生产质量预测比较准确。
목숙（Medicago sativa）질량시영향목숙간초개격적중요인소,이괄시수획시파악목숙간초질량적중요배절。재과학충식관리조건하,대전간목숙질량제전판단,대준학수획목표질량목숙간초、보증경제효익의의중대。목숙산업교위발체적미국상용GDD화PEAQ법래예측전간목숙질량,이판단춘계목숙적수획시간。당GDD위700～750시（5℃이상적온）,목숙적NDF함량접근40%,당GDD증가220（7d후）,NDF함량체도45%;PEAQ법중지출,NDF화ADF함량가이통과재구유수궤양방중경간최고식주적경장측량화판단양방중최성숙식주적성숙도래예측。GDD화PEAQ법대잡초교소、장세건강적목숙전생산질량예측비교준학。
Quality is a very significant factor that affects the alfalfa hay price. Harvesting at optimal time is a critical way to obtain high quality hay. With the scientific cultivating, predicting the quality of standing alfalfa in field is important to harvest the targeted quality hay and improve the farmers" profit. In the alfalfa industry developed countries, such as USA, GDD(Growing degree-days)and PEAQ (Predictive Equations for Alfalfa Quality) are usually used to predict the quality of standing alfalfa, and determine the optimal harvesting time at spring. Some related researches showed that alfalfa with averages 40% NDF is at 700~750 GDD (base 5 ~C ). It takes about 220 additional GDD to reach 45% NDF at GDD (base 5℃). With the PEAQ method,NDF and ADF eould be accurately determined in field by measuring height of the tallest stem and maturity of the most mature stem in a sample area. The GDD and PEAQ would be predicted accurately under the situation of the al- falfa field grows well and contains little weeds.