川东丘陵区头季稻农艺措施对再生稻产量的影响

INFLUENCE OF CULTIVATING PRATICES OF MAIN RICE ON THE PRODUCTION OF RATOON RICE IN HILLY AREA OF EAST SICHUAN

本文用二次回归正交旋转组合设计方法,研究了头季稻密肥措施对再生稻产量的影响,建立了相应数学模型,解析了农艺措施的主效应和互作效应,得到了最优农艺措施组合方案,即在川东丘陵区,头季稻采用密度30.73～31.54万穴/hm^2,施纯N126.21～128.96kg/hm^2,P_2O_580.34～82.78kg/hm^2,K_2O95.42～103.84kg/hm^2;于头季稻齐穗后15天施促芽肥纯N55.20kg/hm^2,头季稻收后5天内施发苗N肥27.60kg/hm^2,稻桩高度0.33—0.36m.再生稻可达3000kg/hm^2以上,两季总产可超过11250kg/hm^2.

Effects of main rice density and fertilizers on the yield of ratoon tice was studied by means of quadiatic regression orthogonal rotation design. Based on the establishment of the cori-esponding function models and the evaluation of the cullural practices in main season rice, the best combinative approach was selected and determined as follows: the density of 307300-315400 plants/hm2, N of 126.21-128.9kg/hm2, P2O580.34-82.7kg/hm2, and K2O95.42-l63.84kg/ hm2, then supplying N feiHlizei 55.20kg/hm2, 15 days after full heading stage, and 27.6kg/ hm2 within 5 days after the main rice harvested with a cutting height of 0.33-0.36m. The yield of the main rice leached 3000kg/hm2 or more and the total yield of main and ratoon rice exce-ded 11250k/hm2.