RELATIONSHIP BETWEEN THE RATE OF FERTILIZER NITROGEN APPLIED TO GRASSLAND AND MILK-PRODUCTION - ANALYSIS OF RECORDED FARM DATA

被引：7

作者：

HAWKINS, SW

ROSE, PH

机构：

[1] Imperial Chemical Industries Limited, Agricultural Division

来源：

GRASS AND FORAGE SCIENCE | 1979年 / 34卷 / 03期

关键词：

D O I：

10.1111/j.1365-2494.1979.tb01468.x

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

The milk yields obtained from 845 herd‐years within the ICI Recorded Farms Scheme have been correlated, by multiple regression analysis, with the N fertilizer supplied to the grassland, the quantities of concentrates fed and the stocking rates. The large quantity of data gave highly significant correlations which indicated that, over the whole period, the supply of an extra 1 kg N from fertilizer was associated with an average extra yield of 9·9 1 milk. 4·9 1 were associated with the extra N independently of any simultaneous changes in either stocking rate or concentrate feeding, and 4‐5 1 were ascribable to a simultaneous increase in stocking rate. There was a substantial variation in the ‘milk yield per kg N’ response from year to year, but the average value over 6 years agreed closely with that observed in the period 1949–52. Copyright © 1979, Wiley Blackwell. All rights reserved

引用

页码：203 / 208

页数：6