水稻肥料分施與稻穀產量之影響

Abstract

本試驗以9種肥料處理，採用隨時區組法設計，重複四次，以臺中65號為供試品種，同時在臺北二個場所進行試驗。 依據本試驗結果得知，由於氮、鉀之分施可以增加稻米產量，其原因乃由於每穗退化穎花數之減少，結實率及千粒重的增加所致。

The design of this experiment was a randomized complete block with 4 replications and 9 fertilizer treatments,the total plot was 36, the plot size was 102m. The trial was located at two villages near Taipei, Taichung 65 was used in the test, the plant spacing was 22.5 by 22.5cm, with 5 seedlings being transplanted at each hill. Ammonium sulphate, calcium superphosphate and potassium sulphate were used as sources of N, P2O5 and K2O respecti-vely, which were applied at the rate of 100, 50 and 100 kg per ha in first rice crop and 90, 50, 100 in second rice crop. Experimental results obtained indicated that split of application of nitrogen and potass-ium fertilizers was effective in increasing paddy yield in both crops of rice. The yield incre-ase was due to the decreased of the number of degenerated spikelets per panicle, the higher percentage of fertility grains and the weight of 1,000 grain.