水稻硝酸錏鈣追肥施用試驗報告

Abstract

1. 若硝酸錏鈣比照硫酸錏同樣施用，即以1/2氮素作基肥，其餘1/2在第一期作插秧後20日施用，或在第二期作插秧後15日施用時，其肥效確較硫酸錏者為低，若以硫酸錏區之谷錏產量各作為100，則硝酸鈣鈣區之谷藁產量指數，在第一期作各為86.2及85.1，在第二期作各為92.3及90.5。若以每公斤氮素對于谷藁增產之公斤數比較之，硫酸錏中每公斤氮素在第一期作可較硝酸錏鈣中者多增產谷實7.3公斤，藁稈8.5公斤，在第二期作多增產谷實2.5公斤，藁稈4.2公斤。 The purpose of this experiment was to study the merit of nitrochalk to he applied as a base dressing or as a top dressing and to find out the proper time of applying nitrochalk. Since application of nitrochalk alone would cause a reduction in yield of grain and straw as found by previous investigators, comparisons of treatments with various amount of ammonium sulphate applied as a base dressing in combination with a portion of nitrochalk as a top dressing were also made. This experiment was conducted at 8 locations under a representative variety of soils and climate conditions in 1955-1957.