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以杂交水稻为主要参试材料，辅之以常规稻品种进行了外源植物生长物质调节水稻“粒间顶端优势”的试验。于水稻初德期施用浓度为１０ｍｇ／Ｌ的ＧＡ３可增强单穗粒间顶端优势，虽增加粒重，提高结实率，但效果不稳定，有些处理反有下降，且多数杂交水稻未获增产，仅提高常规晚粳稻产量。于水稻初穗期施用浓度为１０ｍｇ／Ｌ的ＰＰ３３３可抑制单穗粒间百端优势，增加每穗实粒数，提高结实率和千粒重，增加杂交稻和常规稻产量。此外，高浓度ＧＡ３或ＰＰ３３３（ＧＡ３≥３０ｍｇ／Ｌ，ＰＰ３３３≥５０ｍｇ／Ｌ）均可能引起水稻减产。将ＧＡ３和ＰＰ３３３适当复配后，研制成二元植物生长物质“粒粒饱”。
The hybrid rice as the main test material, supplemented by conventional rice varieties were exogenous plant growth substances to regulate rice “grain top edge” of the experiment. The application of GA3 at a concentration of 10 mg / L in early rice stage enhanced the tip superiority among single grain spikes, although the grain weight was increased and the seed setting rate was increased, the effect was not stable, and some treatments declined but most hybrid rice did not increase yield. Only increase the yield of conventional late japonica rice. Application of 10 mg / L PP333 at the early heading stage of rice inhibited the superiority of Baihui per panicle, increased the number of solid grains per panicle, increased the seed setting rate and 1000-grain weight, and increased the yield of hybrid and conventional rice. In addition, the high concentration of GA3 or PP333 (GA3≥30mg / L, PP333≥50mg / L) may cause rice yield reduction. GA3 and PP333 appropriate compound, developed into a binary plant growth material “full grain.”